[ What matters most to Dean aren't material things, an idea seen by some humans as the path towards enlightenment. The care he takes to wrap and carry the jug of holy oil at Castiel's request means that much more for it. Castiel doesn't immediately stand as he takes a moment to appreciate Dean. ]

I was just wondering if the existential dread I feel at the potential loss of my grace is at all comparable to the human condition.

[ In other words, no, he's not okay, but yes, he is "hanging on." Since Dean seems fully packed, Castiel takes it as his cue to stand. He's slow and unsteady, in pain and still dusted in dried blood, but he manages to gather himself enough to walk with relative pride to meet Dean by the door. ]