Statesmen and beauties are very rarely sensible of the gradations of their decay.

We are as often duped by diffidence as by confidence.

A weak mind is like a microscope, which magnifies trifling things but cannot receive great ones.

Be wiser than other people if you can; but do not tell them so.

Never seem wiser, nor more learned, than the people you are with. Wear your learning, like your watch, in a private pocket: and do not merely pull it out and strike it; merely to show that you have one.

In the ordinary course of things, how many succeed in society merely by virtue of their manners, while others, however meritorious, fail through lack of them? After all, it's only barbarians who wear uncut precious stones.

It seems to me that your doctor [Tronchin] is more of a philosopher than a physician. As for me, I much prefer a doctor who is anoptimist and who gives me remedies that will improve my health. Philosophical consolations are, after all, useless against real ailments. I know only two kinds of sickness--physical and moral: all the others are purely in the imagination.