We also said above (chapter 14) that no repair occurs to the body – that is, to the exaggerated desire to receive – during the six thousand years [of this world’s existence] that are meant for the service of Torah and mitzvot. Whatever repairs a person achieves through that service affect only the soul, which rises along the upward path of sanctity and purity. That expands the desire to give that appears with the soul.
For this reason, the body will eventually be buried and decompose, since it was not repaired at all. But it [the body] will not remain in that state [of decomposition], for if the exaggerated desire to receive would be annihilated from the world, the plan of creation would not be fulfilled. That is because [the plan of creation] involves [creatures] receiving all of the great pleasures that God planned to bequeath to them.
After all, the great desire to receive and the great pleasure received are proportional to one another, and any diminishment of the desire to receive will diminish the pleasure of receiving.