If our two loves be one, or thou and I Love so alike, that none doe slacken, none can die.

These lines come from John Donne’s poem “The Good-Morrow,” one of his early love lyrics (often grouped among the Songs and Sonnets) written in the 1590s–early 1600s, before his later career as an Anglican divine and dean of St Paul’s. The poem stages a morning-after awakening in which the speaker and his beloved reflect on how their love has transformed their sense of life and the world. Donne draws on the era’s language of exploration and cosmology—“sea-discoverers,” “maps,” and “hemispheres”—to frame erotic and spiritual union as a new, complete world.

Donne imagines love as a perfect mutuality: if the lovers’ “two loves be one,” neither partner’s affection diminishes (“slacken”), and so the love cannot “die.” The claim fuses emotional reciprocity with metaphysical reasoning: what is perfectly balanced has no internal cause of decay. The couple becomes a single, self-sufficient “world,” echoing Renaissance ideas about harmony and proportion while also challenging ordinary temporality—true love is not merely intense but structurally enduring. The lines also imply an ethical demand: immortality depends on equality, on neither lover withholding or dominating the other.