It is impossible for the rival to lament and cry out like I do. He possesses neither the heart, nor the courage, nor the nerve, nor the endurance.

The poet draws a poignant contrast between true devotion and shallow infatuation. To truly cry out in love is not an act of weakness, but a fierce endurance that demands enduring immense pain without breaking down. The rival can never match this depth of lamentation, simply because he lacks the courage, fortitude, and soul-deep grit required to bear such consuming passion.