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Letter to Frank Belknap Long (27 February 1931), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 312
Non-Fiction, Letters, to Frank Belknap Long

Letter to Frank Belknap Long (27 February 1931), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 307
Non-Fiction, Letters, to Frank Belknap Long

However, that wouldn't work in Poland or New York City, where the Jews are of an inferior strain, & so numerous that they would essentially modify the physical type.
Letter to Natalie H. Wooley (22 November 1934), in Selected Letters V, 1934-1937 edited by August Derleth and Donald Wandrei, p. 77
Non-Fiction, Letters

Letter to Frank Belknap Long (27 February 1931), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 291
Non-Fiction, Letters, to Frank Belknap Long

Letter to Harry O. Fischer (late February 1937), in Selected Letters V, 1934-1937 edited by August Derleth and Donald Wandrei, pp. 416-417
Non-Fiction, Letters

Letter to Clark Ashton Smith (7 November 1930), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 214
Non-Fiction, Letters

Fiction, Hypnos (1922)
Context: May the merciful gods, if indeed there be such, guard those hours when no power of the will, or drug that the cunning of man devises, can keep me from the chasm of sleep. Death is merciful, for there is no return therefrom, but with him who has come back out of the nethermost chambers of night, haggard and knowing, peace rests nevermore. Fool that I was to plunge with such unsanctioned frensy into mysteries no man was meant to penetrate; fool or god that he was — my only friend, who led me and went before me, and who in the end passed into terrors which may yet be mine!

Fiction, The Call of Cthulhu (1926)
Context: They worshipped, so they said, the Great Old Ones who lived ages before there were any men, and who came to the young world out of the sky. Those Old Ones were gone now, inside the earth and under the sea; but their dead bodies had told their secrets in dreams to the first men, who formed a cult which had never died. This was that cult, and the prisoners said it had always existed and always would exist, hidden in distant wastes and dark places all over the world until the time when the great priest Cthulhu, from his dark house in the mighty city of R'lyeh under the waters, should rise and bring the earth again beneath his sway. Some day he would call, when the stars were ready, and the secret cult would always be waiting to liberate him.

"Celephaïs" - Written early November 1920; first published in The Rainbow, No. 2 (May 1922)<!-- p. 10-12 -->
Fiction
Context: There are not many persons who know what wonders are opened to them in the stories and visions of their youth; for when as children we listen and dream, we think but half-formed thoughts, and when as men we try to remember, we are dulled and prosaic with the poison of life. But some of us awake in the night with strange phantasms of enchanted hills and gardens, of fountains that sing in the sun, of golden cliffs overhanging murmuring seas, of plains that stretch down to sleeping cities of bronze and stone, and of shadowy companies of heroes that ride caparisoned white horses along the edges of thick forests; and then we know that we have looked back through the ivory gates into that world of wonder which was ours before we were wise and unhappy.

“I have no use for the machine age or any of its conceptions, methods, & ideals.”
Letter to Frank Belknap Long (27 February 1931), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 300
Non-Fiction, Letters, to Frank Belknap Long
Context: All I want is to know things. The black gulph of the infinite is before me... I have no use for the machine age or any of its conceptions, methods, & ideals. I have use only for abstract cognition without social or utilitarian connotations; the thing which Thales & Anaxagoras & Heraclitus went after, & which was clearly definable by the word philosophy until those pragmatical puffballs Socrates & Plato threw a monkey-wrench into the works & crippled human thought for the next two millennia. Now it is a matter of perfect indifference to me whether or not baser interests cluster round the search for truth & lick the molasses-drops that ooze out of the fact-barrel. This apelike parasitism of the herd means nothing either for or against the abstract is-or-isn't quest which Thales began, Democritus continued, & Einstein prolongs. If machine-culture chooses to worship "science", that's its own business. It doesn't imply that the abstract process of cognition-craving turns about & reciprocally worships machine-culture!... Cognition, as such, is completely without social or aesthetic implications except so far as it places certain obvious contradictions of natural laws, & certain pointless exaltations of empty trivialities, in a light so unfavourable as to encourage obsolescence. It is nobody's tool or handmaiden—it is itself alone. Practically speaking, the mind likely to worship pure cognition most sincerely is that most of all opposed to industrialism & standardisation. Cognition is that branch of human desire & celebration most antipodally removed from anything envisaged or wished by Thomas A. Edison, Henry Ford, & the late Charles P. Steinmetz. It is the enemy of urban civilisation as it is the enemy of all handicaps which cripple the free individualistic excursions of the disinterested intellect into unknown cosmic space. It is the sworn ally of beauty because it is itself one of the supreme forms of beauty—the catharsis of a primal, titanic urge which links man to the uttermost gulfs of dramatic immensity. It is one with the greatest music & the loftiest poetry—being perhaps a glimpse of the liberating & expanding reality which both are blindly seeking.

Letter to Catherine L. Moore (7 February 1937), in Selected Letters V, 1934-1937 edited by August Derleth and Donald Wandrei, pp. 407-408
Non-Fiction, Letters

“Unhappy is he to whom the memories of childhood bring only fear and sadness.”

In "The Tao of Jeet Kune Do" by Bruce Lee (1975, compiled and published posthumously) and also in Striking Thoughts: Bruce Lee's Wisdom for Daily Living (2000) edited by John Little, this is attributed to Lee, perhaps because it was found in his notes, but it is also quoted in precisely this form, from what appear to be translations of Taoist writings in The Religions of Man (1958) by Huston Smith. It is actually from Xinxin Ming, by the Third Chinese Chan [Zen] Patriarch Sengcan.
Misattributed

When asked by his brother Robert if he believed in God, p. 129
The Warrior Within : The Philosophies of Bruce Lee (1996)