“Why, this man seemed barely older than himself, Emmanuel thought. He gave off a sense of almost irresistible vigor. Quite simply, he had at last become a man…”

Fiction, The Enemy in the Blanket (1958)

Source: A Scanner Darkly

El hombre, cuando es solamente lo que parece ser el hombre, casi no es nada.
Voces (1943)

Source: The Science of Rights 1796, P. 119

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 565.

As quoted in Omnipotence and Other Theological Mistakes by Charles Hartshorne (1984)
Context: Appealing to his [Einstein's] way of expressing himself in theological terms, I said: If God had wanted to put everything into the universe from the beginning, He would have created a universe without change, without organisms and evolution, and without man and man's experience of change. But he seems to have thought that a live universe with events unexpected even by Himself would be more interesting than a dead one.

Part Five, Chapter 6.
Blue Highways (1982)

As quoted in O₂ : Breathing New Life Into Faith (2008) by Richard Dahlstrom, p. 223; this source is disputed as it does not cite an original document for the quote.
Disputed
Context: Isn't it bewildering … that everything is so beautiful, despite all the horrors that exist? Lately I've noticed something grand and mysterious peering into my sheer joy in all that is lovely — the sense of a Creator whom innocent creation worships with its beauty. Only man can be hateful or ugly, because he possesses a free will to cut himself off from the chorus of praise. It often seems that he will succeed in drowning out this chorus with his cannon thunder, curses, and blasphemy. But it has become clear to me this spring that he cannot. And so I must try to throw myself on the side of the victor.