Necessity is the mother of invention.

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

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.

Common sense is the collection of prejudices acquired by age eighteen.

It is what you read when you don't have to that determines what you will be when you can't help it.

I cannot teach anybody anything. I can only make them think

Industrialize or perish.

The schools ain't what they used to be and never was.

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.

I am indebted to my father for living, but to my teacher for living well.

Dare to think for yourself.

Better know nothing than half-know many things.

Reading furnishes the mind only with materials of knowledge; it is thinking that makes what we read ours.

I cannot live without books.

The knowledge of all things is possible

A little knowledge is a dangerous thing. So is a lot.

Knowledge, Action, Devotion are complementary to each other.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

The ability to observe without evaluating is the highest form of intelligence.

A witty saying proves nothing.

I learned very early the difference between knowing the name of something and knowing something.