Just as with cars, it's critical to know the fuel efficiency of black holes.

Millions of Germans had absolute faith in Hitler. Millions of Russians had faith in Stalin. Millions of Chinese had faith in Mao. Billions have had faith in imaginary gods.

This is The Tonight Show. I can't tell you too much about it, other than the fact that this program is going to go on forever.

I do not understand those who take little or no interest in the subject of religion. If religion embodies a truth, it is certainly the most important truth of human existence. If it is largely error, then it is one of monumentally tragic proportions—and should be vigorously opposed.

Nothing is better than the unintended humor of reality.

The problem is that once the untrained mind has made a formal commitment to a religious philosophy - and it does not matter whether that philosophy is generally reasonable and high-minded or utterly bizarre and irrational

In a rational society we would want our presidents to be teachers. In our actual society we insist they be cheerleaders.