Not in these words. The sentence is a modern condensation of Coleman Barks’s English version of a passage from Rumi’s Masnavi (Book I, verses 3225–27), published in The Essential Rumi (1995) as “That’s where the light enters you.” In Rumi’s Persian, the light is the ray of a spiritual teacher’s healing plaster shining on the wound.
What it means
As it is shared today, the line says that pain and damage are what open a person to insight or grace. Rumi’s own passage is more specific: let a wise teacher dress your wound, keep your attention on the dressing, and understand that the healing comes from that ray of light, not from yourself.
Where it comes from
The passage belongs to Book I of the Masnavi. In R. A. Nicholson’s literal translation, flies gathering on a wound stand for your thoughts and your love of possessions; when the Pir (spiritual guide) lays a plaster on it, the pain goes quiet, and you fancy the wound has healed, whereas “the (healing) ray of the plaster has shone upon the (wounded) spot.” The next verse warns: do not turn your head away from the plaster, and do not think the cure comes from your own constitution.
Coleman Barks, who did not read Persian and reworked earlier English translations such as Nicholson’s, turned this into the free-verse poem “Childhood Friends”: “Don’t turn your head. Keep looking at the bandaged place. That’s where the light enters you.” Quote Investigator verified the lines on page 142 of The Essential Rumi (1995). The popular one-sentence version drops the teacher and the bandage and makes the wound itself the doorway — an idea the original does not quite state. No Persian verse matching the popular sentence was found.