“It is the conscious man or woman who finds the secret of happiness and contentment; and that, surely, is the ultimate success.”

An Apology for Idlers.
Virginibus Puerisque and Other Papers (1881)
Context: A happy man or woman is a better thing to find than a five-pound note. He or she is a radiating focus of goodwill; and their entrance into a room is as though another candle had been lighted. We need not care whether they could prove the forty-seventh proposition; they do a better thing than that, they practically demonstrate the great Theorem of the Liveableness of Life.

Memoirs of Childhood and Youth (1924)
Variant: A great secret of success is to go through life as a man who never gets used up.
Context: The great secret of success is to go through life as a man who never gets used up. That is possible for him who never argues and strives with men and facts, but in all experience retires upon himself, and looks for the ultimate cause of things in himself.

Volume 1 [Bernhard Tauchnitz, 1860] ( p. 336 https://books.google.com/books?id=rszxUvpszaMC&pg=PA336)
Also in The King of Inventors: A Life of Wilkie Collins by Catherine Peters ( p. 224 https://books.google.com/books?id=T0AABAAAQBAJ&pg=PA224)
Source: The Woman in White (1859)

Source: Sex and Character (1903), p. 113.

Mind makes up the soul, or better, the "animus" of woman, and just as the anima of a man consists of inferior relatedness, full of affect, so the animus of woman consists of inferior judgments, or better, opinions.
The Secret of the Golden Flower (1931) Commentary by C.G.Jung in CW 13: Alchemical Studies. P. 60

[Martha Mitchell, Saturday Evening Post, Fall 1971, 243, 2, 50-53]

Source: The Museum of Innocence