One may summon his philosophy when they are beaten in battle, not till then.

[Theodore Roosevelt] was a naturalist on the broadest grounds, uniting much technical knowledge with knowledge of the daily lives and habits of all forms of wild life. He probably knew tenfold more natural history than all the presidents who had preceded him, and, I think one is safe in saying, more human history also.

Science makes no claim to infallibility; it leaves that claim to be made by theologians.

[Nuclear weapons] now I think I mentioned around 27,000 and during the Cold War the total global arsenal was on the order of 70,000.

I want nothing less than a faith founded upon a rock, faith in the constitution of things. The various man-made creeds are fictitious, like the constellations Orion, Cassiopeia’s Chair, the Big Dipper; the only thing real in them is the stars, and the only thing real in the creeds is the soul’s aspiration toward the Infinite.

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.

[Invading Iraq] is not the best way to make a safer world in which the United States would be a responsible partner, but it also goes against the role of law in the United States.