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

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.

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

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.

When the truth finally catches up to you, don't be a hero and run.

For I must write to The Times tonight, and save the world from sin.

Is it truly being good if the only reason I behave well is so I can get more loot at Christmas? I mean, really, all I'm doing is saying I can be bribed.

I think the success of my work stems from being truthful.

Life is not a static thing. The only people who do not change their minds are incompetents in asylums, and those in cemeteries.

It is not the cares of today, but the cares of tomorrow, that weigh a man down.

We need a President that all Americans can respect, not a celebrity who uses words like freedom and liberty like they are a punchline in a reality show.

I thought of the words of the Renaissance philosopher Michel de Montaigne. "If you press me to say why I loved him, I can say no more than because he was he, and I was I.

I watched Ken Burns' Civil War series on PBS. My favorite segment is when Bob Hope entertains the troops at Gettysburg.

Sooner or later, you will see a China-based company that really has a global impact, and I think Baidu has a chance to become one of those companies. We should be able to compete on a global basis.