The effect of love is pain. The love that has no pain is no love. The lover who has not gone through the agonies of love is not a lover, he claims love falsely. ... Rumi describes six signs of the lover: deep sigh, mild expression, moist eyes, eating little, speaking little, sleeping little, which all show the sign of pain in love. Hafiz says, 'All bliss in my life has been the outcome of unceasing tears and continual sighs through the heart of night.'
The sorrow of the lover is continual, in the presence and in the absence of the beloved: in the presence for fear of the absence, and in absence in longing for the presence. According to the mystical view the pain of love is the dynamite that breaks up the heart, even if it be as hard as a rock. When this hardness that covers the light within is broken through, the streams of all bliss come forth as springs from the mountains.