I love how Harry's entire demeanor changes when he's "high" (for lack of a better term). He's entirely confident - not arrogant, but 100% sure in his actions, even when they don't make any logical sense.
Professor Slughorn: Harry! I must insist you accompany me back to the castle immediately!
Harry: That would be counterproductive, sir!
Professor Slughorn: What makes you say that?
Harry: No idea!
And so it struck me: maybe that's what it's like to live and move fully "in the Spirit". Here's aspiring to that.