Any knowledge that doesn't lead to new questions quickly dies out: it fails to maintain the temperature required for sustaining life.

Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.

I do not know how to teach philosophy without becoming a disturber of the peace.

Evil being the root of mystery, pain is the root of knowledge.

Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.

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

In order to stave off covetouness, greed, and spite, citizens world over must be educated.

The deepest sin against the human mind is to believe things without evidence.

We could never learn to be brave and patient, if there were only joy in the world

Many much-learned men have no intelligence.

Seek knowledge from the cradle to the grave.

Investigate, educate and organize.

In mathematics you don't understand things. You just get used to them.

Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

No man's knowledge here can go beyond his experience.

The man who is fond of books is usually a man of lofty thought, and elevated opinions.

Most people have never learned that one of the main aims in life is to enjoy it.

If you're teaching today what you were teaching five years ago, either the field is dead or you are.

The white man is very clever. He came quietly and peaceably with his religion. We were amused at his foolishness and allowed him to stay. Now he has won our brothers, and our clan can no longer act like one. He has put a knife on the things that held us together and we have fallen apart.

Necessity is the mother of invention.

Imagination is more important than knowledge.