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 deeper our insight into the methods of nature . . . the more incredible the popular Christianity seems to us.

I still find each day too short.

To the scientist Nature is a storehouse of facts, laws, processes; to the artist she is a storehouse of pictures; to the poet she is a storehouse of images, fancies, a source of inspiration; to the moralist she is a storehouse of precepts and parables; to all she may be a source of knowledge and joy.

He who marvels at the beauty of the world in summer will find equal cause for wonder and admiration in winter.

The most precious things of life are near at hand, without money and without price. Each of you has the whole wealth of the universe at your very door. All that I ever had, and still have, may be yours by stretching forth your hand and taking it.

The fuel in the earth will be exhausted in a thousand or more years, and its mineral wealth, but man will find substitutes for these in the winds, the waves, the sun's heat, and so forth.