Virtue is that perfect good, which is the complement of a happy life; the only immortal thing that belongs to mortality.

To err is human. To repeat error is of the Devil.

We should every night call ourselves to an account: What infirmity have I mastered today? What passions opposed? What temptation resisted? What virtue acquired? Our vices will abate of themselves if they be brought every day to the shrift.

Nothing is more honorable than a grateful heart.

The way to wickedness is always through wickedness.

The acquisition of riches has been to many not an end to their miseries, but a change in them: The fault is not in the riches, but the disposition.

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.