Everyone knows this is the passion of a lover; tears flowed from eyes moistened by sweet relief.

This poignant couplet is a beautiful declaration of the lover's identity. Mir Taqi Mir suggests that the sheer act of crying—the tears flowing from moist eyes—is enough proof. To the world, the overflowing tears are a visible sign that the wearer of the heart is, indeed, an Aashiq (lover). It's a profound statement that emotion, when visible, speaks louder than any word.