If you have control over the heart, then never do love to it; keep away from this fatal, soul-consuming ailment.

This couplet is a profound warning, a poetic paradox. Mir Taqi Mir suggests that if the beloved holds any power over your heart, you should never fall in love. Why? Because love, in this context, is described as a 'fatal disease' (marz-e-jaan-gudaaz). It's a beautiful, yet devastating warning—a plea to protect oneself from the very emotion that promises ecstasy. It speaks to the self-awareness of the lover, knowing that passion can be destructive.