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

Liberty without Learning is always in peril and Learning without Liberty is always in vain.

What is now proved was once only imagined.

The books that the world calls immoral are books that show the world its own shame.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

As we acquire more knowledge, things do not become more comprehensible but more mysterious.

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

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

A little knowledge that acts is worth infinitely more than much knowledge that is idle.

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

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

I am a part of everything that I have read.

A cynic is a man who knows the price of everything, and the value of nothing.

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

All knowledge that the world has ever received comes from the mind; the infinite library of the universe is in our own mind.

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

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

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

Opinion is the medium between knowledge and ignorance.

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

Just when I thought there wasn't room enough for another thought in my head, I had this great idea.