Pleasure is the effect upon nufs of the radiations from the mind-mesh, which through the falling current of breath form the emotions. But all these are of indirect light, which is subject to the elements and becomes controlled by them.
To rise above the elements it is necessary to touch the heart-plane. This is a realm of pure light not contaminated by the karmic swirl below the mind-mesh. This is the metaphysical explanation, but the explanation of the heart is clear - when it loves, all the rust and dust are purged from its bosom. This is its blessing. Its life is its own blessing - heart is the medicine for heart.