O my heart, do not remind me of the youthful down on the beloved's cheek, lest this very poison proves fatal to both you and me.

In this couplet, the poet gently cautions his own heart against reminiscing about the beloved’s delicate emerging down—a classic metaphor for youthful, budding beauty. While the memory is undeniably captivating, he views it as a slow, seductive poison. He warns that indulging in this painful longing could unleash a grief so potent that it would destroy both his conscious self and the very heart that nurtured the thought.