This one's sort of a no-brainer, given all the exploration imagery in "On First Looking into Chapman's Homer," but it also applies to a young John Keats who is trying to figure out what he wants to do with his life and trying to figure out what it would mean to be a poet. It's also about the exploration that everyone makes to discover something. We all have the impulse to find something new and share it with the world.
Ego alert: We don't explore the universe casually; we are always looking to discover something about ourselves.
With art and with science, at some point there will be nothing left to explore. We will have discovered everything that's out there. And then what will we do for fun?