Physics is like sex: sure, it may give some practical results, but that's not why we do it.
Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.
Common sense is the collection of prejudices acquired by age eighteen.
Books are for people who wish they were somewhere else.
It isn't what we don't know that gives us trouble, it's what we know that ain't so.
What we know is a drop, what we don't know is an ocean.
With educated people, I suppose, punctuation is a matter of rule; with me it is a matter of feeling. But I must say I have great respect for the semi-colon; it's a useful little chap.
No man's knowledge here can go beyond his experience.
The direction in which education starts a man will determine his future in life
The task of a writer is not to solve the problem but to state the problem correctly.
Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.
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.
Science is what we have learned about how to keep from fooling ourselves.
A thought is an idea in transit.
Reading without reflecting is like eating without digesting.
Patience is a virtue, and I'm learning patience. It's a tough lesson.
Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.
The knowledge of all things is possible
Education is a system of imposed ignorance.
Reading is to the mind what exercise is to the body.
The most savage controversies are those about matters as to which there is no good evidence either way.