Love is the measure of life; only so far as we love do we really live.

To learn something new, take the path that you took yesterday.

You cannot use [nuclear weapons] to target civilians; you cannot use them against military targets if they have indiscriminate effects on civilians in addition to the attack on the military target.

The place to observe nature is where you are.

How much there is in books that one does not want to know, that it would be a mere weariness and burden to the spirit to know.

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.

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.