It says...
It says: "By the night when it enshrouds," The use of the term /yaqsa/ ‘enshrouds’ is because night, like a creature, covers half of the globe and brings it under her authority, or is for the reason that the light of the day or the rays of the world-illuminating sun 'hides' when night comes forth.
In any case, it is an evidence to the importance of Night's effective role in men's lives, including the adjustment of the sun's heat, the resting of the living creatures in it, and the adoration of the night by awake, vigilant believers. Then, our attention is attracted to another oath.
It says: "By the day when it brightens up," 'Day' begin from the moment that the light of dawn breaks the curtain of the gloom of night and removes the darkness and dominates the expanse of heaven, filling everywhere and everything with its glory and light; the very light that is the secret of the life of all living things.
In the Qur'an, the contrast of 'light' and 'darkness' and their effect in Man's life is repeatedly stated and emphasized upon, because they are two perpetual great blessings and are also two Divine Signs. Then, the last oath of this Surah is mentioned. It says: "By Him Who created the male and the female," The existence of the mystery of the sexes runs through all life in human beings, animals and plants.
The process of development that occurs in the life-germ from the very beginning until the time of birth, the characteristics of both sexes due to their functions and actions, and the secrets hidden in the sex phenomena are all Signs of the glorious world of creation through which we may understand the greatness of its Creator.
The term /ma/ ‘something, a thing' used, here for Allah is for the extraordinary greatness or His Entity that has an ambiguous state which is beyond the imagination and human concept. Some have also said that /ma/, here in Arabic is 'masdariyah'. If so, the sentence means: 'By the creation of male and female'. But, this interpretation seems feeble. In fact, the first two oaths refer to the celestial Signs while the third oath points to the human signs.
The conclusion of the aforementioned oaths is stated in the next verse. It says: "Verily the (ends) you strive for are diverse.” People have different or diverse aims in life for which they strive. One might be talking of the pleasures of this world while another may be mindful of the life in the Hereafter.