Have you ever heard of imaginal discs? They're tucked away inside caterpillars during the embryonic stage and carry all the genetic information necessary to be a butterfly. But they lie dormant until the caterpillar spins its cocoon and releases enzymes that literally dissolve its entire body. From this goo only the imaginal discs, and enough nerve cells to keep the memories of life as a caterpillar, remain. And from these imaginal discs grow a whole new creature - new eyes, new wings, new legs, new organs, new everything. And for some caterpillars the imaginal discs start to develop into butterfly parts before the cocoon is even spun. You can't see it from the outside, but inside wings are beginning to grow.
Maybe humans, probably only on a metaphysical level but who knows, have something like imaginal discs lying dormant inside of us, too. I suspect I've maybe even known some particularly wondrous treasures whose metamorphosis began before they curled up for that last and deepest sleep. Walking amongst us, they look perfectly ordinary from the outside. It's only when you look far far inside that you realize they've already got everything they need to fly.