The true method of knowledge is an experiment.

To know is to know that you know nothing. That is the meaning of true knowledge.

Knowledge is the life of the mind.

A single conversation across the table with a wise man is better than ten years' of mere study of books.

You teach best what you most need to learn.

Human behavior flows from three main sources: desire, emotion, and knowledge.

The brighter you are, the more you have to learn.

Learning never exhausts the mind.

You discover yourself through the research of your work.

In youth we learn; in age we understand.