The Definition of Beauty is
That Definition is none—
Of Heaven, easing Analysis,
Since Heaven and He are one.
I read Line 2 as a repetition of Line 1 after a brief pause and Lines 2-3 as enjambed, one continuous sentence with no or, at most, a miniscule pause between “none” and “Of”:
“The Definition of Beauty is . . . ., That Definition is none Of Heaven, easing Analysis, since Heaven and He are one.”
ED tells us the gender of Beauty is male; that and the capitalized “He” immediately identify Beauty as Wadsworth. No need to guess about philosophical interpretations, ED eased our Analysis.