There is no more dangerous error than that of mistaking the consequence for the cause.

That which does not kill us makes us stronger.

There is always madness in love. But there is also always some reason in madness.

Sometimes people don't want to hear the truth because they don't want their illusions destroyed.

There are two different types of people in the world, those who want to know, and those who want to believe.

I was in darkness, but I took three steps and found myself in paradise. The first step was a good thought, the second, a good word; and the third, a good deed.

There will always be rocks in the road ahead of us. They will be stumbling blocks or stepping stones; it all depends on how you use them.

You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.

I'm not upset that you lied to me, I'm upset that from now on I can't believe you.

Enjoy life. This is not a dress rehearsal.

The true man wants two things: danger and play. For that reason he wants woman, as the most dangerous plaything.

Science, however, is not just a matter of making mistakes, but of making mistakes in public. Making mistakes for all to see, in the hopes of getting the others to help with the corrections.

Far away there in the sunshine are my highest aspirations. I may not reach them, but I can look up and see their beauty, believe in them, and try to follow where they lead.

If I were to sit down and count them, how many of my prayers were tainted by the seduction of greed? None, simply because nothing of that sort is a prayer.

The biggest tab the public picks up for fossil fuels has to do with what economists call 'external costs,' like the health effects of air and water pollution.

The tendency of modern American women to exclaim 'Hiiiiiiiiiiii!' in soprano octaves and hug each other upon sight can be disconcerting to those unfamiliar with it.

Without food, man at most can live but a few weeks; without it all other components of social justice are meaningless.

To friends and eke to foes true kindness show; No kindly heart unkindly deeds will do; Harshness will alienate a bosom friend. And kindness reconcile a deadly foe.

Life is short. Be of use.

Happiness has a very short half-life.

We are ready to compromise. We are ready to take calculated risks, but for a peace that will give us security.