Saint François de Sales (?), as translated, only possibly (!), by Henry Sebastian Bowden (1877). The original French that I reproduce below comes from p. 383 of tom. 2 of the Vie de Saint François de Sales, évêque et Prince de Genève (1854), by André Jean Marie Hamon (1795–1874), who cites pt. IV sec. xxxii of the 1639-1641 Esprit de saint François de Sales, evêque et prince de Genêve: recueilli de divers écrits de M. Jean-Pierre Camus, evêque de Belley, by Jean-Pierre Camus (1585-1652):
Ah ! leur répondait-il, il vaut mieux avoir à rendre compte de trop de douceur que de trop de sévérité. Dieu n’est-il pas tout amour ? Dieu le père est le père des miséricordes ; Dieu le fils se nomme un agneau, et Dieu le Saint-Esprit se montre sous la forme d’une colombe, qui est la douceur même. S’il y avait quelque chose de meilleur que la bénignité, Jésus Christ nous l’aurait dit; et cependant il ne nous donne que deux leçons à apprendre de lui : la mansuétude [(sometimes douceur)] et l’humilité de cœur. Me voulez-vous donc empêcher d’apprendre la leçon que Dieu m’a donnée, et êtes-vous plus savant que Dieu ?
I have yet to find this passage (considered as a exact quotation) in any version of the Esprit de saint François de Sales that I've managed to locate online so far. E.g. This printing of 1727 not only lacks a pt. XIV chap. xxxii, but is unsearchable. On the other hand, this one of 1865/66 offers, without returning the key phrases, both a pt. XIV sec. xxxii and, at precisely that point in particular, an appeal to St. Anselm to that very same effect. This 1865/66, not to mention other 19th-century printings, might therefore be used more successfully than I've been able to use it so far to find at least the appeal to St. Anselm in variously numbered chapters or sections in the other, much earlier digitized printings that I've tried so far.
I would note also in passing that, though I have not conducted any significant research into the personalities involved (Hamon, who was born about 173 years after de Sales' death; Camus, who knew him well; etc.), this 2001 article by Alexander T. Pocetto, O.S.F.S., first published in 2001, while concluding in favor of Camus (in whose Esprit I, however, have, again, yet to find the very passage in question), grapples with his reputation for unreliability.
Clearly there is more work to be done on this one!