If the facts don't fit the theory, change the facts.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
In mathematics you don't understand things. You just get used to them.
You can never learn less, you can only learn more.
It is better to know how to learn than to know.
I have just three things to teach: simplicity, patience, compassion. These three are your greatest treasures.
Science is a way of thinking much more than it is a body of knowledge.
To read is to fly: it is to soar to a point of vantage which gives a view over wide terrains of history, human variety, ideas, shared experience and the fruits of many inquiries.
There is nothing more notable in Socrates than that he found time, when he was an old man, to learn music and dancing, and thought it time well spent.
Opinion is the medium between knowledge and ignorance.
The more I read, the more I acquire, the more certain I am that I know nothing.
Science is what we have learned about how to keep from fooling ourselves.
I prefer the company of peasants because they have not been educated sufficiently to reason incorrectly.
The great difficulty in education is to get experience out of ideas.
If you want the present to be different from the past, study the past.
The reading of all good books is like conversation with the finest men of past centuries.
A thought is an idea in transit.
If I could explain it to the average person, I wouldn't have been worth the Nobel Prize.
Many much-learned men have no intelligence.
Never help a child with a task at which he feels he can succeed.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.