“Instructing in cures, therapists always recommend that “each case be individualized.” If this advice is followed, one becomes persuaded that those means recommended in textbooks as the best, means perfectly appropriate for the template case, turn out to be completely unsuitable in individual cases.”
A Dreary Story or A Tedious Story (1889)
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Anton Chekhov 222
Russian dramatist, author and physician 1860–1904Related quotes

Compare Gottfried Leibniz argument for the "best of all possible worlds" in his Essays on the Goodness of God, the Freedom of Man and the Origin of Evil
Ch.12
Guide for the Perplexed (c. 1190), Part III
Context: Galen, in the third section of his book, "The Use of the Limbs," says correctly that it would be in vain to expect to see living beings formed of the blood of menstruous women and the semen virile, who will not die, will never feel pain, or will move perpetually, or shine like the sun. This dictum of Galen is part of the following more general proposition:—Whatever is formed of matter receives the most perfect form possible in that species of matter; in each individual case the defects are in accordance with that individual matter.

“It was, perhaps, one of those cases in which advice is good or bad only as the event decides.”
Persuasion (1817)
Works, Persuasion

Source: The Diary of Anaïs Nin, Vol. 1: 1931-1934

“Poison cures in certain contingencies, and in those cases poison is not an evil thing.”
Le venin guerit en quelque rencontre, et, ce cas-là, le venin n'est pas mauvais.
Aristippe, ou De la cour (1658), Discours VI.
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 139.

DC Comics interview http://www.dccomics.com/features/vertigox/vaughan.html

Source: One is A Crowd: Reflections of An Individualist (1952), p. 6