Science is prediction, not explanation.

It is the true nature of mankind to learn from mistakes, not from example.

The man who voyages strange seas must of necessity be a little unsure of himself. It is the man with the flashy air of knowing everything, who is always with it, that we should beware of.

The chance that higher life forms might have emerged through evolutionary processes is comparable with the chance that a tornado sweeping through a junk yard might assemble a Boeing 747 from the material therein.

Outstanding examples of genius - a Mozart, a Shakespeare, or a Carl Friedrich Gauss - are markers on the path along which our species appears destined to tread.

When I was young, the old regarded me as an outrageous young fellow, and now that I'm old the young regard me as an outrageous old fellow.

There is a coherent plan to the universe, though I don't know what it's a plan for.