The progressive development of man is vitally dependent on invention.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
Civilization is a race between disaster and education.
The most savage controversies are those about matters as to which there is no good evidence either way.
Evil being the root of mystery, pain is the root of knowledge.
The only true wisdom is in knowing you know nothing.
There is one quality which one must possess to win, and that is definiteness of purpose, the knowledge of what one wants, and a burning desire to possess it.
Imagination is more important than knowledge.
If you want the present to be different from the past, study the past.
If the facts don't fit the theory, change the facts.
The reading of all good books is like conversation with the finest men of past centuries.
Medicine is my lawful wife and literature my mistress; when I get tired of one, I spend the night with the other.
I decided to teach because I think that any person who studies philosophy has to be involved actively.
The man who does not read good books has no advantage over the man who can't read them.
A man who has never gone to school may steal a freight car; but if he has a university education, he may steal the whole railroad.
Investigate, educate and organize.
Science is a rising force, It is creating a new world about us. It needs to be watched and pressed into service, and in any case, it would be courting disaster to ignore it.
The schools ain't what they used to be and never was.
Seek knowledge from the cradle to the grave.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
A cynic is a man who knows the price of everything, and the value of nothing.