I cannot live without books.

If you can't explain it simply, you don't understand it well enough.

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

The secret of life is not enjoyment but education through experience.

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

I am so clever that sometimes I don't understand a single word of what I am saying.

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

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it.

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

Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

What we know is a drop, what we don't know is an ocean.

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

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

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

Science is a way of thinking much more than it is a body of knowledge.

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

Learn as though you would never be able to master it; hold it as though you would be in fear of losing it.

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

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

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

Patience is a virtue, and I'm learning patience. It's a tough lesson.