A teacher can never truly teach unless he is still learning himself. The teacher who has come to the end of his subject, who has no living traffic with his knowledge but merely repeats his lesson to his students, can only load their minds, he cannot quicken them.

Power comes not from knowledge kept but from knowledge shared.

Your most unhappy customers are your greatest source of learning.

It is a good thing for the uneducated man to read books of quotations.

People die, but books never die.

The more informed you are, the less arrogant and aggressive you are.