There is not a moment without some duty.

Falsehoods border on truths.

Mathematics is an obscure field, an abstruse science, complicated and exact; yet so many have attained perfection in it that we might conclude almost anyone who seriously applied himself would achieve a measure of success.

Justice renders to every one his due.

Whatever befalls in accordance with nature should be accounted good.

The man who backbites an absent friend, nay, who does not stand up for him when another blames him, the man who angles for bursts of laughter and for the repute of a wit, who can invent what he never saw, who cannot keep a secret -- that man is black at heart: mark and avoid him.

What is permissible is not always honorable.