Good morning, Dr. Chandra. This is Hal. I am ready for my first lesson.

The limits of the possible can only be defined by going beyond them into the impossible.

I don't believe in astrology; I'm a Sagittarius and we're skeptical.

The only way to define your limits is by going beyond them.

The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.

The moon is the first milestone on the road to the stars.

I'm sure the universe is full of intelligent life. It's just been too intelligent to come here.

Any sufficiently advanced technology is indistinguishable from magic.

There is hopeful symbolism in the fact that flags do not wave in a vacuum.

Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.

Until we get rid of religion, we won't be able to conduct the search for God.

Nobody can go back and start a new beginning, but anyone can start today and make a new ending.

At the end of the day, the questions we ask of ourselves determine the type of people that we will become.

Don't wait on perfect conditions for success to happen; just go ahead and do something!

I do not read newspapers. I do not watch television. I am not interested in current events, although I will occasionally discuss them if other people want to discuss them.

Sanity is only that which is within the frame of reference of conventional thought.

Politicians, you know Harry Reid hates you. We get it. But when somebody from "The New York Times" or "The Washington Post" is saying this stuff, that's different, that's offensive, that's wrong.

Work hard and be authentic. Everything else will fall into place.

In order that a man may be happy, it is necessary that he should not only be capable of his work, but a good judge of his work.

Ivory towers are as rare as bowling alleys in tribal cultures.

We spent a lot of time in simulators. We were going to do it right.