If there is a God, it's going to be a whole lot bigger and a whole lot more incomprehensible than anything that any theologian of any religion has ever proposed.

It can be consoling to think your children are in heaven. You have got to understand that that doesn't make it true. Many people cannot understand that distinction.

You can't imagine how gratifying it is to have a reader come up to you and say, 'You changed my life.'

People who believe the earth was created 6000 years ago, when it's actually 4.5 billion years old, should also believe the width of North America is 8 yards. That is the scale of the error.

We admit that we are like apes, but we seldom realize that we are apes.

We should learn to understand natural selection, so that we can oppose any tendency to apply it to human politics.

Be thankful that you have a life, and forsake your vain and presumptuous desire for a second one.