Part 4: And thus His oneness is revealed. Several things are involved here. First, His oneness itself is actually revealed. Since this involves evil reverting into good, it could not actually come about until evil was actually revealed in the lower realms.
Secondly, the revelation of God’s oneness is so precious that His creatures will have the greatest delight when they attain it. Thirdly, this revelation, which involves initial concealment, provides a place for service and, when attained, for reward. Since evil exists only during the phase of service to reveal His oneness, the service does not need to last forever. “ ‘Today to do them’ – and tomorrow to receive their reward” (Eruvin 22a on Deut. 7:11).
For as soon as His oneness is revealed, there is no further need for service, because …this itself is the delight of the souls: the revelation of His unity is itself precisely the goodness that, as we have said, He wants to bestow.