Reason is the substance of the universe. The design of the world is absolutely rational.

It's incredible how much intelligence is used in this world to prove nonsense.

If you hate something thoroughly without knowing why, you can be sure there is something of it in your own nature.

One lie does not cost you one truth, but the truth.

What you can become you are already.

Whoever wants to be a judge of human nature should study people's excuses.

Most people are good only so long as they believe others to be so.

If language had been the creation not of poetry but of logic, we should only have one.

With someone who holds nothing but trumps, it is impossible to play cards.

In a good play, everyone is in the right.

That Man, who flees from truth, should have invented the mirror is the greatest of historical miracles.

Today, you can pick your own news. At no time has the world been this compatible with apathy.

Every formula which expresses a law of nature is a hymn of praise to God.

Knowledge is not something which you learn and then remembers it for a while.But, knowledge is that which you learn, remembers it for eternity and use it when unexpected.

Gratitude is the memory of the heart.

Surrendering to God is not passive resignation, fatalism, or an excuse for laziness.

It's a pity I flew only once. A space flight is like a drug - once you experience it, you can't think of anything else.

Cheshvan starts tonight," Rixon said, "What are you doing arsing around in a graveyard?" "Thinking." "Thinking?" "A process by which I use my brain to make a rational decision.

I came from nothing. I came from the projects and welfare and ended up a millionaire with no frame of reference. I was bound to hit a wall sooner or later.

A friend of mine told me to shoot first and ask questions later. I was going to ask him why, but I had to shoot him.

As we grow older, our capacity for enjoyment shrinks, but not our appetite for it.