Courage is adversity's lamp.

We are so presumptuous that we think we can separate our personal interest from that of humanity, and slander mankind without compromising ourselves.

When an idea is not robust enough to stand expression in simple terms, it is a sign that it should be rejected.

Lazy people are always anxious to be doing something.

Clearness marks the sincerity of philosophers.

To execute great things, one should live as though one would never die.

All that causes one man to differ from another is a very slight thing. What is it that is the origin of beauty or ugliness, health or weakness, ability or stupidity? A slight difference in the organs, a little more or a little less bile. Yet this more or less is of infinite importance to men; and when they think otherwise they are mistaken.