“Nature is one. There is only one truth in life. We have a single universe, which has a sole creator.”

The Inferno (1917), Ch. XIV
Context: I wanted to know the secret of life. I had seen men, groups, deeds, faces. In the twilight I had seen the tremulous eyes of beings as deep as wells. I had seen the mouth that said in a burst of glory, "I am more sensitive than others." I had seen the struggle to love and make one's self understood, the refusal of two persons in conversation to give themselves to each other, the coming together of two lovers, the lovers with an infectious smile, who are lovers in name only, who bury themselves in kisses, who press wound to wound to cure themselves, between whom there is really no attachment, and who, in spite of their ecstasy deriving light from shadow, are strangers as much as the sun and the moon are strangers. I had heard those who could find no crumb of peace except in the confession of their shameful misery, and I had seen faces pale and red-eyed from crying. I wanted to grasp it all at the same time. All the truths taken together make only one truth. I had had to wait until that day to learn this simple thing. It was this truth of truths which I needed.
Not because of my love of mankind. It is not true that we love mankind. No one ever has loved, does love, or will love mankind. It was for myself, solely for myself, that I sought to attain the full truth, which is above emotion, above peace, even above life, like a sort of death. I wanted to derive guidance from it, a faith. I wanted to use it for my own good.

"Six Asides About Culture"
Living in Truth (1986)
Context: There is only one Art, whose sole criterion is the power, the authenticity, the revelatory insight, the courage and suggestiveness with which it seeks its truth. … Thus, from the standpoint of the work and its worth it is irrelevant to which political ideas the artist as a citizen claims allegiance, which ideas he would like to serve with his work or whether he holds any such ideas at all.

VII. Communication, Secrecy, and Social Policy. p. 129
The Human Use of Human Beings (1950)

Annotations to Morga's Sucesos de las Islas Filipinas - translated by Austin Craig

The Paris Review interview (1982)
Context: You know C. S. Lewis, whom I greatly admire, said there’s no such thing as creative writing. I’ve always agreed with that and always refuse to teach it when given the opportunity. He said there is, in fact, only one Creator and we mix. That’s our function, to mix the elements He has given us. See how wonderfully anonymous that leaves us? You can’t say, “I did this; this gross matrix of flesh and blood and sinews and nerves did this.” What nonsense! I’m given these things to make a pattern out of. Something gave it to me.
I’ve always loved the idea of the craftsman, the anonymous man. For instance, I’ve always wanted my books to be called the work of Anon, because Anon is my favorite literary character. If you look through an anthology of poems that go from the far past into the present time, you’ll see that all the poems signed “Anon” have a very specific flavor that is one flavor all the way through the centuries. I think, perhaps arrogantly, of myself as “Anon.” I would like to think that Mary Poppins and the other books could be called back to make that change. But I suppose it’s too late for that.

Elements de la géométrie de l'infini (1727) as quoted by Amir R. Alexander, Geometrical Landscapes: The Voyages of Discovery and the Transformation of Mathematical Practice (2002) citing Michael S. Mahoney, "Infinitesimals and Transcendent Relations: The Mathematics of Motion in the Late Seventeenth Century" in Reappraisals of the Scientific Revolution, ed. David C. Lindberg, Robert S. Westman (1990)

Writings of the Young Marx on Philosophy and Society, L. Easton, trans. (1967), p. 38
Reflections of a Youth on Choosing an Occupation (1835)

As quoted in Journey Through Genius (1990) by William Dunham ~
Context: This view [of the infinite], which I consider to be the sole correct one, is held by only a few. While possibly I am the very first in history to take this position so explicitly, with all of its logical consequences, I know for sure that I shall not be the last!

Source: Introduction to Systems Philosophy (1972), p. 119.