Mu'awiyah (May Allah be pleased with him) reported:
The Messenger of Allah said, "When Allah wishes good for someone, He bestows upon him the understanding of Deen."

[Al-Bukhari and Muslim].

وعن معاوية رضي الله عنه قال: قال رسول الله ﷺ : "من يرد الله به خيرًا يفقه في الدين" ((متفق عليه))