Prepare for the unknown, unexpected and inconceivable . . . after 50 years of flying I'm still learning every time I fly.

Curiosity is the essence of human existence.

We leave as we came, and, God willing, as we shall return, with peace and hope for all mankind.

I'm quite disappointed that I'm still the last man on the moon.

If you begin to think you're something you're not, you're looking in the wrong mirror.

I've been asked about UFOs and I've said publicly I thought they were somebody else, some other civilization.

We went into darkness after being in daylight the whole time on the way to the Moon. And then we went into darkness. And we're in the shadow... of the Moon.

Yes, I am the last man to have walked on the moon, and that's a very dubious and disappointing honor. It's been far too long.

The mass gross absence of sound in space is more than just silence.

Nobody can take those footsteps I made on the surface of the moon away from me.

We will certainly see teachers, journalists, artists and poets in space. Whatever it takes to the be the best is what it will take to get you into space.

I am against making golf courses obsolete, going to the national Open and playing half the holes with a one-iron.

A wide range of quotations are necessary for the repertoire of a well-rounded speaker. Quotations are able to illustrate in a few words what is difficult to explain in many.

Pardon me for breathing, which I never do any way so I don’t know why I bother to say it, oh God, I’m so depressed.

Honest unaffected distrust of human abilities under all circumstances is the surest sign of strength of mind.

Being willing to suffer often brings great rewards.

When I met Paul Ryan 22 years ago, he was a student at Miami of Ohio volunteering on my campaign.

What is commonly called literary history is actually a record of choices.

I like to get to bed with a clear head.

I don't believe man-made global warming is settled in science enough.

If I have kids, I'll adopt.