M4:53 — مر عسس را ساخته یزدان سبب / تا ز بیم او دود در باغ شب

This couplet is the hinge-point of the story, revealing the divine providence hidden within a seemingly disastrous event. A lover, pursued by the city's night patrol (ʿasas), flees in terror. His flight leads him to leap into a random, dark garden for safety. What appears to be a misfortune is, in fact, a divinely arranged 'cause' (sabab).

The watchman, an agent of fear and state power, becomes an unwitting instrument of God's grace. The fear he inspires is the force that propels the lover not just to safety, but to the very place where his beloved happens to be. The lover's desperate act of running from what he hates leads him directly to what he loves.

Rumi uses this narrative to illustrate a core Sufi and Quranic principle, explicitly cited in the story's title: "It may be that you dislike a thing while it is good for you" (Quran 2:216). The 'disliked thing' (the chase) is the necessary cause for the 'good thing' (the union). The beyt shifts the perspective from the lover's panic to a God's-eye view, where even apparent evils and worldly threats are woven into a larger tapestry of benevolent purpose.