"Vital engagement" describes how an initial, ordinary interest can deepen over years into something that provides flow, community, identity, and a genuine sense of purpose — not through any single dramatic turning point, but through a long accumulation of small, self-directed investments that compound. What starts as simply enjoying an activity gradually becomes something closer to a lens the person sees their whole life through.
The pattern matters because it offers a realistic, achievable model for building meaning: not waiting for a single transformative event, but recognizing that sustained, self-directed investment in something genuinely interesting — skill development, deepening knowledge, building relationships around it — is itself the mechanism by which an ordinary interest becomes a source of real purpose.