“It is often maintained that friendship between men and women can never approach the high level of friendship between men. How, it is objected, could sensuality not be present in such relationships? if it were not present, would not the least coquettish of women feel herself humiliated? It is contrary to every natural impulse for a man to associate with a woman as freely as is usual in friendship without occasionally being conscious of physical desire, and if he is conscious of it, the whole machinery of the passions is set in motion.”
Un Art de Vivre (The Art of Living) (1939), The Art of Friendship
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André Maurois 202
French writer 1885–1967Related quotes

“Thus they are destitute of that very lovely and exquisitely natural friendship, which is an object of desire in itself and for itself, nor can they learn from themselves how valuable and powerful such a friendship is. For each man loves himself, not that he may get from himself some reward for his own affection, but because each one is of himself dear to himself. And unless this same feeling be transferred to friendship, a true friend will never be found; for a true friend is one who is, as it were, a second self.”
Ita pulcherrima illa et maxime naturali carent amicitia per se et propter se expetita nec ipsi sibi exemplo sunt, haec vis amicitiae et qualis et quanta sit. Ipse enim se quisque diligit, non ut aliquam a se ipse mercedem exigat caritatis suae, sed quod per se sibi quisque carus est. Quod nisi idem in amicitiam transferetur, verus amicus numquam reperietur; est enim is qui est tamquam alter idem.
Section 80; translation by J. F. Stout
Laelius De Amicitia – Laelius On Friendship (44 BC)

[Film4, Channel Four Television Corporation, http://www.film4.com/features/article/olly-blackburn-and-david-bloom-on-donkey-punch, 23 February 2012, Olly Blackburn and David Bloom on Donkey Punch, 2008]
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"A Painful Case"
Source: Dubliners (1914)
Context: One of his sentences, written two months after his last interview with Mrs. Sinico, read: Love between man and man is impossible because there must not be sexual intercourse and friendship between man and woman is impossible because there must be sexual intercourse.
“Friendship often ends in love; but love in friendship—never.”
Vol. II; LXXXIII
Lacon

“Friendship often ends in love, but love in friendship - never.”

Women Can't Hear What Men Don't Say (2000)