May crown him with fame, and must win him the loveOf his father on earth and his father above. (15-16)
The phrase "may crown" is similar to "may make" (14) in that, in both cases, it's not clear what or who is doing the "making." Sure, with a little work we can say "tender warmth" is doing the making, but the strangeness of a verb ("make") without a noun is an important effect. It implies that we can't quite know what "makes" someone a poet. It's just too darn complicated.