Quran 51:49 – 'And Of All Things Two Types'
All those things which are in pairsz they need to be in Paris. The world in its structure demands to have it’s counterpart which is missing otherwise it stands a futile venture. So God tells that He does not do things for nothing. When we keep it’s counterpart, the life after death for the sake accoumtability, the the scheme of its creation makes sense. Even if some things are not in pairs, but the world is among those ones which demand their counter part .