“.. the wish to produce beautiful things — when that wish is true and profound — falls together with [man's] striving for perfection.”

In "Karl Barth's Conception of God" (1952) http://mlk-kpp01.stanford.edu/primarydocuments/Vol2/520102BarthsConceptionOfGod.pdf by Martin Luther King, Jr., King cites this as a statement of Barth's in The Epistle to the Romans, p. 91, but it does not actually appear in the 1933 translation of Edwin Hoskyns. It may be a paraphrase of some of Barth's ideas which were incorrectly cited.
Disputed

Source: Sebastian

those are like killing words. That's my death, if I don’t pummel it into his soft, not-yet-completely-formed radio disc-jockey skull that I am already beautiful, and I wish for nothing, other than for him to go away. I am so beautiful, sometimes people weep when they see me. And it has nothing to do with what I look like really, it is just that I gave myself the power to say that I am beautiful, and if I could do that, maybe there is hope for them too. You can't even get to me. I got special service, boundaries like the rings of Saturn. I am protected. I am four–five faggots deep all around me, who don't see your name on the list, who will not let you in here looking like that, who will hold you in a cold, hard, unflinching stare or back hand compliment you until you cry. If you even had the courage to ask me out you would have to do it by mail, sent months in advance, on a single 5×7 sheet of eggshell vellum, signed in blood and sealed in gold and scented with a light mist of the new fragrance by Alan Cumming, just so I could throw it away without becoming repulsed.
From Her Weblog

Book I; ix, 46
Amores (Love Affairs)

Source: A Farewell to Arms

Letter to Elisabeth Nietzsche, Bonn, 1865-06-11. Quoted in Walter Kaufmann, The Faith of a Heretic (opening epigram).
Variant: Here the ways of men divide. If you wish to strive for peace of soul and happiness, then believe; if you wish to be a disciple of truth, then inquire.
Source: Twilight of the Idols

Le malheur est que, parfois, des souhaits s'accomplissent, afin que se perpétue le supplice de l'espérance.
Denier du rêve (1934), translated as A Coin in Nine Hands (1994) by Dori Katz, Ch. 3, p. 31 ISBN 0-226-96527-9

Golden Sayings of Epictetus
Context: True instruction is this: —to learn to wish that each thing should come to pass as it does. And how does it come to pass? As the Disposer has disposed it. Now He has disposed that there should be summer and winter, and plenty and dearth, and vice and virtue, and all such opposites, for the harmony of the whole. (26).

Source: Bared to You