Science has done more for the development of western civilization in one hundred years than Christianity did in eighteen hundred years.

The rocks are not so close akin to us as the soil; they are one more remove from us; but they lie back of all, and are the final source of all. ... Time, geologic time, looks out at us from the rocks as from no other objects in the landscape.

The U.S. had about 10,000 nuclear warheads. It is estimated that the U.S. is heading towards having 6,000 nuclear warheads in the year 2012.

One resolution I have made, and try always to keep, is this: ‘To rise above little things’.

I seldom go into a natural history museum without feeling as if I were attending a funeral.

In the printed page the only real things are the paper and the ink; the white spaces play the same part in aiding the eye to take in the meaning of the print as do the black letters.

The spirit of man can endure only so much and when it is broken only a miracle can mend it.