Opinions, theories, and systems pass by turns over the grindstone of time, which at first gives them brilliancy and sharpness, but finally wears them out.

Axioms are delightful in theory, but impossible in practice.

Extremes produce reaction. Beware that our boasted civilization does not lapse into barbarism.

The woman who too easily and ardently yielded her devotion will find that its vitality, like a bright fire, soon consumes itself.

Vices are often habits rather than passions.

The absolute ruler may be a Nero, but he is sometimes a Titus or Marc Aurelius; the people is often Nero, but never Marc Aurelius.

If poverty makes man groan, he yawns in opulence. When fortune exempts us from labor, nature overwhelms us with time.