If you're not learning while you're earning, you're cheating yourself out of the better portion of your compensation.

To every action there is always an equal and opposite or contrary, reaction

Better know nothing than half-know many things.

No power and no treasure can outweigh the extension of our knowledge.

Books are as useful to a stupid person as a mirror is useful to a blind person.

Necessity is the mother of invention.

The knowledge of all things is possible

Study without desire spoils the memory, and it retains nothing that it takes in.

Learning never exhausts the mind.

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.

The highest result of education is tolerance.

If the facts don't fit the theory, change the facts.

When you know better you do better.

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

The first principle is that you must not fool yourself and you are the easiest person to fool.

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

The most important part of teaching is to teach what it is to know.

Knowledge, Action, Devotion are complementary to each other.

The only good is knowledge and the only evil is ignorance.

All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.

The most savage controversies are those about matters as to which there is no good evidence either way.