It is one thing to remember, another to know. To remember is to safeguard something entrusted to the memory. But to know is to make each thing one's own, not depend on the text and always to look back to the teacher. "Zeno said this, Cleanthes said this." Let there be space between you and the book.

We are as answerable for what we give as for what we receive; nay, the misplacing of a benefit is worse than the not receiving of it; for the one is another person's fault, but the other is mine.

Laugh at your problems; everybody else does.

You should keep on learning as long as there is something you do not know.

The mind makes the nobleman, and uplifts the lowly to high degree.

It is equally a fault to believe all men or to believe none.

Fortune can take away riches, but not courage.