Sonnet 79 (Spenser)
Neoplatonic Beauty
Spenser divides beauty into two types: physical (what men see) and spiritual ("gentle wit" and "vertuous mind"). This is straight Neoplatonism—outer beauty is just shadow of inner truth.
Corruption Formula
"That doth flesh ensew"—ensew means "follow after." Physical corruption is the inevitable consequence of having a body. Only the mind escapes.
Divine Genealogy
Her inner beauty proves divine ancestry. Spenser's claiming her virtue literally descends from God ("that fayre Spirit")—this is Renaissance love poetry as theology.
Final Monopoly
Only God is truly beautiful ("He only fayre"), and only what God made beautiful stays beautiful. Everything else is counterfeit currency.