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.

There exists no more difficult art than living.

Persistent kindness conquers the ill-disposed.

No man is free who is a slave to the flesh.

The physician cannot prescribe by letter, he must feel the pulse.

What else is nature but God?

For what else is Nature but God and the Divine Reason that pervades the whole universe and all its parts.