I think my life in general, like that of any human being, has highs and lows, has moments of great light and moments of great darkness.

I don't think Osama is a Muslim. I don't think Osama is a human being.

I'll tell you, being involved in human space flight, it is an emotional endeavor. I think it brings in the highest highs and the lowest lows.

I think self-knowledge is the rarest trait in a human being.

I think I've become more comfortable about being a human being.

I don't think I'm a particularly somber human being.