A mistake is always forgivable, rarely excusable and always unacceptable.

It is a cliche that most cliches are true, but then like most cliches, that cliche is untrue.

The most certain sign of wisdom is cheerfulness.

You can best serve civilization by being against what usually passes for it.

When prosperity comes, do not use all of it.

It is better to be looked over than overlooked.

Instinct is a marvellous thing. It can neither be explained nor ignored.

Doubt is the origin of wisdom

The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.

Gravity is only the bark of wisdom's tree; but it preserves it

Desire is the very essence of man.

Promises are like crying babies in a theater, they should be carried out at once.

A person reveals his character by nothing so clearly as the joke he resents.

Loneliness adds beauty to life. It puts a special burn on sunsets and makes night air smell better.

What a liberation to realize that the “voice in my head” is not who I am. Who am I then? The one who sees that.

You don't become what you want, you become what you believe

The lie is a condition of life.

Knowing is not enough, we must apply. Willing is not enough, we must do.

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact

Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth.

It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.