My sufferings from confusion and self-betrayal have paradoxically strengthened my love; the ruin of past love becomes the foundation for a greater, renovated love.
The opening catalogues the speaker's sufferings: potions of tears, distilled poisons, fears applied to hopes and hopes to fears. The speaker exists in a state of perpetual oscillation and confusion ('madding fever'). This is love as psychological torment: eyes fitted out of their 'spheres,' a consciousness fragmented by obsession. The losses are real, the self-betrayals genuine, not performed as in 117.
The sestet accomplishes a remarkable rhetorical reversal: the speaker finds that 'by evil still made better' is a paradoxical truth. Ruined love, when rebuilt, 'Grows fairer than at first, more strong, far greater.' This isn't mere rationalization; it's a claim that surviving love's destruction makes love stronger. The speaker's return to 'content' is hard-won, purchased through genuine suffering and error.
You've made terrible relationship mistakes, hurt someone you cared about, been a wreck. But living through that wreckage somehow rebuilt you more honestly. Now you understand commitment differently—not as avoiding pain but as moving through it.