Medicine is mostly assistance. Stitches hold two edges near each other; they do not do the joining. A cast keeps bone still; it does not knit it. Antibiotics clear the field so your own defences can finish the work.
Every one of those is support for a process that already belongs to you.
Worth knowing on days when you feel like a passenger in a system of appointments and prescriptions. You are not the raw material being worked on. You are the thing doing the healing, and the rest is scaffolding built around it.