“My further advice on your relations to women is based upon that other motto of chivalry, "Serve all, love one."”
Mes avis sur vos relations avec les femmes sont aussi dans ce mot de chevalerie: Les servir toutes, n'en aimer qu'une.
Le lys dans la vallée (1836), translated by Katharine Prescott Wormeley, part II: First Love.
Original
Mes avis sur vos relations avec les femmes sont aussi dans ce mot de chevalerie: Les servir toutes, n'en aimer qu'une.
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Honoré de Balzac 157
French writer 1799–1850Related quotes

1950s, The Chance for Peace (1953)

“All the relations of men and women are being changed by this one factor”
Our Changing Morals, in The Mansions of Philosophy: A Survey of Human Life and Destiny, (1929), Simon and Schuster, New York, ch. 5. p. 119.
Context: The invention and spread of contraceptives is the proximate cause of our changing morals. The old moral code restricted sexual experience to marriage, because copulation could not be effectively separated from parentage, and parentage could be made responsible only through marriage. But to-day the dissociation of sex from reproduction has created a situation unforeseen by our fathers. All the relations of men and women are being changed by this one factor; and the moral code of the future will have to take account of these new facilities which invention has placed at the service of ancient desires.

“The knights in [Britain] that were famous for feats of chivalry, wore their clothes and arms all of the same colour and fashion: and the women also no less celebrated for their wit, wore all the same kind of apparel; and esteemed none worthy of their love, but such as had given a proof of their valour in three several battles. Thus was the valour of the men an encouragement for the women's chastity, and the love of the women a spur to the soldier's bravery.”
Quicumque vero famosus probitate miles in eadem erat unius coloris vestibus atque armis utebatur facete etiam mulieres consimilia indumenta habentes. Nullius amorem habere dignabantur nisi tercio in milicia probates esset. Efficiebantur ergo caste et meliores et milites pro amore illarum probiores.
Bk. 9, ch. 13; pp. 244-5.
Sometimes said to be the earliest reference to love as an ennobling influence.
Historia Regum Britanniae (History of the Kings of Britain)

“When love is your motto. Even heaven will not deny you success in your life.”

Source: Lioness of Africa, 19 October 2017https://www.lionessesofafrica.com/blog/2017/10/19/quote-of-the-day-by-divine-ndhlukula

Thoughts and Aphorisms (1913), Karma

Addresses
Source: Muslim leader calls for Media Responsibility in fight against Extremism https://www.pressahmadiyya.com/press-releases/2016/03/muslim-leader-calls-for-media-responsibility-in-fight-against-extremism/, Peace Symposium 19 March 2016