"The first principle is that you must not fool yourself – and you are the easiest person to fool."
— Richard Feynman
"What I cannot create, I do not understand."
— Richard Feynman
"If you want to master something, teach it."
— Richard Feynman
"I would rather have questions that can't be answered than answers that can't be questioned."
— Richard Feynman
"Study hard what interests you the most in the most undisciplined, irreverent and original manner possible."
— Richard Feynman
"The unexamined life is not worth living."
— Socrates
"I know that I know nothing."
— Socrates
"The only true wisdom is in knowing you know nothing."
— Socrates
"We are what we repeatedly do. Excellence, then, is not an act, but a habit."
— Aristotle
"It is the mark of an educated mind to be able to entertain a thought without accepting it."
— Aristotle
"Knowing yourself is the beginning of all wisdom."
— Aristotle
"Clear thinking requires courage rather than intelligence."
— Naval Ravikant
"Read what you love until you love to read."
— Naval Ravikant
"The most important skill for getting rich is becoming a perpetual learner."
— Naval Ravikant
"Arm yourself with specific knowledge, accountability, and leverage."
— Naval Ravikant
"I think, therefore I am."
— René Descartes
"Doubt is the origin of wisdom."
— René Descartes
"The best way to predict the future is to invent it."
— Alan Kay
"Man is the measure of all things."
— Protagoras
"The greatest wealth is to live content with little."
— Plato
"Wisdom begins in wonder."
— Socrates
"Stay hungry. Stay foolish."
— Steve Jobs
"Innovation distinguishes between a leader and a follower."
— Steve Jobs
"Your time is limited, don't waste it living someone else's life."
— Steve Jobs
"The people who are crazy enough to think they can change the world are the ones who do."
— Steve Jobs
"Design is not just what it looks like and feels like. Design is how it works."
— Steve Jobs
"He who has a why to live can bear almost any how."
— Friedrich Nietzsche
"That which does not kill us makes us stronger."
— Friedrich Nietzsche
"Without music, life would be a mistake."
— Friedrich Nietzsche
"You must be the change you wish to see in the world."
— Mahatma Gandhi
"Live as if you were to die tomorrow. Learn as if you were to live forever."
— Mahatma Gandhi
"The future depends on what you do today."
— Mahatma Gandhi
"In a gentle way, you can shake the world."
— Mahatma Gandhi
"Be yourself; everyone else is already taken."
— Oscar Wilde
"To live is the rarest thing in the world. Most people exist, that is all."
— Oscar Wilde
"The only way to do great work is to love what you do."
— Steve Jobs
"No man ever steps in the same river twice, for it's not the same river and he's not the same man."
— Heraclitus
"The only thing I know is that I know nothing."
— Socrates
"First principles thinking is one of the best ways to reverse-engineer complicated situations."
— Elon Musk
"When something is important enough, you do it even if the odds are not in your favor."
— Elon Musk
"I think it's possible for ordinary people to choose to be extraordinary."
— Elon Musk
"If you can't explain it to a six-year-old, you don't understand it yourself."
— Albert Einstein
"Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world."
— Albert Einstein
"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
— Albert Einstein
"The important thing is not to stop questioning. Curiosity has its own reason for existence."
— Albert Einstein
"Logic will get you from A to B. Imagination will take you everywhere."
— Albert Einstein
"The true sign of intelligence is not knowledge but imagination."
— Albert Einstein
"A person who never made a mistake never tried anything new."
— Albert Einstein
"Try not to become a man of success, but rather try to become a man of value."
— Albert Einstein
"Life is like riding a bicycle. To keep your balance, you must keep moving."
— Albert Einstein
"However difficult life may seem, there is always something you can do and succeed at."
— Stephen Hawking
"Intelligence is the ability to adapt to change."
— Stephen Hawking
"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."
— Stephen Hawking
"We are just an advanced breed of monkeys on a minor planet of a very average star."
— Stephen Hawking
"Look up at the stars and not down at your feet."
— Stephen Hawking
"Somewhere, something incredible is waiting to be known."
— Carl Sagan
"We are made of star-stuff. We are a way for the cosmos to know itself."
— Carl Sagan
"Extraordinary claims require extraordinary evidence."
— Carl Sagan
"The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself."
— Carl Sagan
"For small creatures such as we, the vastness is bearable only through love."
— Carl Sagan
"An expert is a person who has made all the mistakes that can be made in a very narrow field."
— Niels Bohr
"If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet."
— Niels Bohr
"Prediction is very difficult, especially if it's about the future."
— Niels Bohr
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth."
— Niels Bohr
"Mathematics is the language in which God has written the universe."
— Galileo Galilei
"You cannot teach a man anything; you can only help him discover it in himself."
— Galileo Galilei
"All truths are easy to understand once they are discovered; the point is to discover them."
— Galileo Galilei
"In mathematics you don't understand things. You just get used to them."
— John von Neumann
"Pure mathematics is, in its way, the poetry of logical ideas."
— Albert Einstein
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding."
— William Paul Thurston
"It is not that we have a short time to live, but that we waste a lot of it."
— Seneca
"We suffer more often in imagination than in reality."
— Seneca
"Luck is what happens when preparation meets opportunity."
— Seneca
"You have power over your mind - not outside events. Realize this, and you will find strength."
— Marcus Aurelius
"The happiness of your life depends upon the quality of your thoughts."
— Marcus Aurelius
"Waste no more time arguing about what a good man should be. Be one."
— Marcus Aurelius
"If it is not right, do not do it. If it is not true, do not say it."
— Marcus Aurelius
"The best revenge is to be unlike him who performed the injury."
— Marcus Aurelius
"Very little is needed to make a happy life; it is all within yourself, in your way of thinking."
— Marcus Aurelius
"The impediment to action advances action. What stands in the way becomes the way."
— Marcus Aurelius
"Accept the things to which fate binds you, and love the people with whom fate brings you together."
— Marcus Aurelius
"If I have seen further, it is by standing on the shoulders of giants."
— Isaac Newton
"Nature and nature's laws lay hid in night; God said 'Let Newton be' and all was light."
— Isaac Newton (Epitaph)
"What we know is a drop, what we don't know is an ocean."
— Isaac Newton
"To explain all nature is too difficult a task for any one man or even for any one age."
— Isaac Newton
"I can calculate the motion of heavenly bodies, but not the madness of people."
— Isaac Newton
"The present is theirs; I work for the future."
— Nikola Tesla
"If you want to find the secrets of the universe, think in terms of energy, frequency and vibration."
— Nikola Tesla
"The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries."
— Nikola Tesla
"Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more."
— Nikola Tesla
"What one man calls God, another calls the laws of physics."
— Nikola Tesla
"Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less."
— Marie Curie
"Be less curious about people and more curious about ideas."
— Marie Curie
"I was taught that the way of progress was neither swift nor easy."
— Marie Curie
"Life is not easy for any of us. But what of that? We must have perseverance and above all confidence in ourselves."
— Marie Curie
"One never notices what has been done; one can only see what remains to be done."
— Marie Curie
"Genius is one percent inspiration and ninety-nine percent perspiration."
— Thomas Edison
"I have not failed. I've just found 10,000 ways that won't work."
— Thomas Edison
"Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time."
— Thomas Edison
"Opportunity is missed by most people because it is dressed in overalls and looks like work."
— Thomas Edison
"There's a way to do it better - find it."
— Thomas Edison
"Learning is not attained by chance, it must be sought for with ardor and diligence."
— Leonardo da Vinci
"Simplicity is the ultimate sophistication."
— Leonardo da Vinci
"I have been impressed with the urgency of doing. Knowing is not enough; we must apply."
— Leonardo da Vinci
"Art is never finished, only abandoned."
— Leonardo da Vinci
"The noblest pleasure is the joy of understanding."
— Leonardo da Vinci
"It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change."
— Charles Darwin
"A man who dares to waste one hour of time has not discovered the value of life."
— Charles Darwin
"Ignorance more frequently begets confidence than does knowledge."
— Charles Darwin
"The highest possible stage in moral culture is when we recognize that we ought to control our thoughts."
— Charles Darwin
"In the long history of humankind, those who learned to collaborate most effectively have prevailed."
— Charles Darwin
"We can only see a short distance ahead, but we can see plenty there that needs to be done."
— Alan Turing
"Sometimes it is the people no one can imagine anything of who do the things no one can imagine."
— Alan Turing
"Those who can imagine anything, can create the impossible."
— Alan Turing
"A computer would deserve to be called intelligent if it could deceive a human into believing that it was human."
— Alan Turing
"Science is a way of thinking much more than it is a body of knowledge."
— Carl Sagan
"The only impossible journey is the one you never begin."
— Tony Robbins
"Success is not final, failure is not fatal: it is the courage to continue that counts."
— Winston Churchill
"We make a living by what we get, but we make a life by what we give."
— Winston Churchill
"Attitude is a little thing that makes a big difference."
— Winston Churchill
"Success consists of going from failure to failure without loss of enthusiasm."
— Winston Churchill
"An equation for me has no meaning, unless it expresses a thought of God."
— Srinivasa Ramanujan
"An equation means nothing to me unless it expresses a thought of God."
— Srinivasa Ramanujan
"While asleep I had an unusual experience. There was a red screen formed by flowing blood as it were. I was observing it. Suddenly a hand began to write on the screen."
— Srinivasa Ramanujan
"No, it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways."
— Srinivasa Ramanujan (on 1729)
"Ask the right questions, and nature will open the doors to her secrets."
— C.V. Raman
"The essence of science is independent thinking, hard work, and not equipment."
— C.V. Raman
"I strongly believe that fundamental science cannot be driven by instructional, industrial, governmental or military pressures."
— C.V. Raman
"Success can come to you by courageous devotion to the task lying in front of you."
— C.V. Raman
"I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the seashore."
— C.V. Raman
"I was just a student who was interested in mathematics and physics."
— Satyendra Nath Bose
"I have got nothing to be sad about. Whatever I had to do in my life, I have done."
— Satyendra Nath Bose
"I know quite clearly what I want out of my life. Life and my emotions are the only things I am conscious of."
— Homi J. Bhabha
"No power on earth can stop an idea whose time has come."
— Homi J. Bhabha
"The acquisition of knowledge is a duty incumbent on every Muslim."
— Homi J. Bhabha
"He who can listen to the music in the midst of noise can achieve great things."
— Vikram Sarabhai
"We must be second to none in the application of advanced technologies to the real problems of man and society."
— Vikram Sarabhai
"There are some who question the relevance of space activities in a developing nation. To us, there is no ambiguity of purpose."
— Vikram Sarabhai
"The urge to achieve should be stronger than the fear of failure."
— Vikram Sarabhai
"I feel that we have a great responsibility to the nation to contribute constructively toward the building of a modern India."
— Jagadish Chandra Bose
"In this rejoicing India, there is one thing I miss - the intolerance that marks modern progress."
— Jagadish Chandra Bose
"It is wrong to think that the task of physics is to find out how nature is. Physics concerns what we can say about nature."
— Jagadish Chandra Bose
"The true laboratory is the mind, where behind illusions we uncover the laws of truth."
— Jagadish Chandra Bose
"He who loves practice without theory is like the sailor who boards ship without a rudder and compass."
— Meghnad Saha
"Science is the most reliable guide for civilization, for life, for success in the world."
— Meghnad Saha
"Discovery is primarily a matter of rearranging or transforming evidence."
— Subrahmanyan Chandrasekhar
"The pursuit of science has often been compared to the scaling of mountains, high and not so high."
— Subrahmanyan Chandrasekhar
"Science is a perception of the world around us. Science is a place where what you find in nature pleases you."
— Subrahmanyan Chandrasekhar
"The black holes of nature are the most perfect macroscopic objects there are in the universe."
— Subrahmanyan Chandrasekhar
"We are all capable of infinitely more than we believe."
— Swami Vivekananda
"Arise, awake, and stop not until the goal is reached."
— Swami Vivekananda
"Take up one idea. Make that one idea your life. Think of it, dream of it, live on that idea."
— Swami Vivekananda
"In a conflict between the heart and the brain, follow your heart."
— Swami Vivekananda
"The greatest religion is to be true to your own nature. Have faith in yourselves."
— Swami Vivekananda
"You cannot believe in God until you believe in yourself."
— Swami Vivekananda
"All differences in this world are of degree, and not of kind, because oneness is the secret of everything."
— Swami Vivekananda
"The moment I have realized God sitting in the temple of every human body, the moment I stand in reverence before every human being."
— Swami Vivekananda
"Talk to yourself once in a day, otherwise you may miss meeting an excellent person in this world."
— Swami Vivekananda
"Where can we go to find God if we cannot see Him in our own hearts and in every living being?"
— Swami Vivekananda
"Dream, dream, dream. Dreams transform into thoughts and thoughts result in action."
— A.P.J. Abdul Kalam
"You have to dream before your dreams can come true."
— A.P.J. Abdul Kalam
"If you want to shine like a sun, first burn like a sun."
— A.P.J. Abdul Kalam
"All of us do not have equal talent. But, all of us have an equal opportunity to develop our talents."
— A.P.J. Abdul Kalam
"Failure will never overtake me if my determination to succeed is strong enough."
— A.P.J. Abdul Kalam
"Let us sacrifice our today so that our children can have a better tomorrow."
— A.P.J. Abdul Kalam
"Excellence is a continuous process and not an accident."
— A.P.J. Abdul Kalam
"Man needs difficulties in life because they are necessary to enjoy the success."
— A.P.J. Abdul Kalam
"Thinking should become your capital asset, no matter whatever ups and downs you come across in your life."
— A.P.J. Abdul Kalam
"To succeed in your mission, you must have single-minded devotion to your goal."
— A.P.J. Abdul Kalam
"Great dreams of great dreamers are always transcended."
— A.P.J. Abdul Kalam
"Climbing to the top demands strength, whether it is to the top of Mount Everest or to the top of your career."
— A.P.J. Abdul Kalam
"When we tackle obstacles, we find hidden reserves of courage and resilience we did not know we had."
— A.P.J. Abdul Kalam
"God, our Creator, has stored within our minds and personalities, great potential strength and ability."
— A.P.J. Abdul Kalam
"One best book is equal to hundred good friends but one good friend is equal to a library."
— A.P.J. Abdul Kalam
"The only way to make sense out of change is to plunge into it, move with it, and join the dance."
— Alan Watts
"You are under no obligation to be the same person you were five minutes ago."
— Alan Watts
"Man suffers only because he takes seriously what the gods made for fun."
— Alan Watts
"The meaning of life is just to be alive. It is so plain and so obvious and so simple."
— Alan Watts
"Trying to define yourself is like trying to bite your own teeth."
— Alan Watts
"The best time to plant a tree was 20 years ago. The second best time is now."
— Chinese Proverb
"Do not go where the path may lead, go instead where there is no path and leave a trail."
— Ralph Waldo Emerson
"What lies behind us and what lies before us are tiny matters compared to what lies within us."
— Ralph Waldo Emerson
"For every minute you are angry you lose sixty seconds of happiness."
— Ralph Waldo Emerson
"Write it on your heart that every day is the best day in the year."
— Ralph Waldo Emerson
"The only person you are destined to become is the person you decide to be."
— Ralph Waldo Emerson
"What you do makes a difference, and you have to decide what kind of difference you want to make."
— Jane Goodall
"The question isn't who is going to let me; it's who is going to stop me."
— Ayn Rand
"Everything can be taken from a man but one thing: the last of the human freedoms - to choose one's attitude."
— Viktor Frankl
"Between stimulus and response there is a space. In that space is our power to choose our response."
— Viktor Frankl
"When we are no longer able to change a situation, we are challenged to change ourselves."
— Viktor Frankl
"Those who have a 'why' to live, can bear with almost any 'how'."
— Viktor Frankl
"What is to give light must endure burning."
— Viktor Frankl
"It is not the mountain we conquer, but ourselves."
— Edmund Hillary
"Do one thing every day that scares you."
— Eleanor Roosevelt
"The future belongs to those who believe in the beauty of their dreams."
— Eleanor Roosevelt
"No one can make you feel inferior without your consent."
— Eleanor Roosevelt
"You gain strength, courage and confidence by every experience in which you really stop to look fear in the face."
— Eleanor Roosevelt
"Yesterday is history, tomorrow is a mystery, today is a gift of God, which is why we call it the present."
— Bil Keane
"The only limit to our realization of tomorrow will be our doubts of today."
— Franklin D. Roosevelt
"It always seems impossible until it's done."
— Nelson Mandela
"Education is the most powerful weapon which you can use to change the world."
— Nelson Mandela
"I learned that courage was not the absence of fear, but the triumph over it."
— Nelson Mandela
"The greatest glory in living lies not in never falling, but in rising every time we fall."
— Nelson Mandela