Why does no one confess his sins? Because he is yet in them. It is for a man who has awoke from sleep to tell his dreams.

God never repents of what He has first resolved upon.

A single lifetime, even though entirely devoted to the sky, would not be enough for the study of so vast a subject. A time will come when our descendants will be amazed that we did not know things that are so plain to them.

My joy in learning is partly that it enables me to teach.

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

It is only luxury and avarice that make poverty grievous to us; for it is a very small matter that does our business, and when we have provided against cold, hunger, and thirst, all the rest is but vanity and excess.

Friendship always benefits; love sometimes injures.