The story
Variant of the Latin Quem di diligunt adulescens moritur ("whom the gods love dies young"), from Plautus's Bacchides, apparently adapted from a line in Dis Exapaton (The Double Deceiver) by Menander: ὅν οἱ θεοὶ φιλοῦσιν ἀποθνῄσκει νέος.
Etymology from Wiktionary, CC BY-SA 4.0.