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.

Be silent as to services you have rendered, but speak of favours you have received.

A man who has taken your time recognises no debt; yet it is the one he can never repay.

Set aside a certain number of days, during which you shall be content with the scantiest and cheapest fare, with course and rough dress, saying to yourself the while: " Is this the condition that I feared?"

Tranqility is a certain quality of mind, which no condition or fortune can either exalt or depress.

Every day, therefore, should be regulated as if it were the one that brings up the rear, the one that rounds out and completes our lives.

If we let things terrify us, life will not be worth living.