The end of an argument or discussion should be, not victory, but enlightenment.
[Le but de la dispute ou de la discussion ne doit pas être la victoire, mais l’amélioration.]
Joseph Joubert (1754-1824) French moralist, philosopher, essayist, poet
Pensées [Thoughts], “De la Famille et de la Société, etc. [On the Family and Society],” ¶ 41 (1850 ed.) [tr. Collins (1928), ch. 7]
(Source)
(Source (French)). Alternate translations:The aim of disputation and discussion should not be victory, but improvement.
[tr. Calvert (1866), ch. 8]The aim of argument, or of discussion, should not be victory, but progress.
[tr. Lyttelton (1899), ch. 7, ¶ 31]