Whom the gods would destroy, they first make mad
Whom the gods would destroy, they first make mad is a saying that has appeared in English literature in varying forms since the 17th century. In some variations, "gods" is replaced with "God" or "Jupiter," and the saying is sometimes rendered in Latin: Quos Deus / Quem Iuppiter vult perdere, prius dementat.
Source: Wikipedia — Whom the gods would destroy, they first make mad (CC BY-SA 4.0)