Quran 16:3 · An-Nahl

The reality of religion is that man should apprehend the Being of God and His workmanship in the universe so intensely and realistically that the Being of the one God should become everything for him; man should fear only Him and on Him alone, should he build up his hopes. The one God should be the entire focus of his heart and mind. This is what constitutes the act of making God the object of worship (ilah) and amounts to praying to Him. All the prophets came into the world in order to bring about this condition. Those who prove to have this sense of submission to God will be treated as successful on Judgement Day, but those who go against this will be left without hope. For the general people, this decision will be taken on Doomsday (Judgement Day), but for the addressees of the prophet, it starts in this world itself. There is perfect unity in the universe and at the same time, there also is perfect meaningfulness. Unity in the universe makes it unwarranted for anyone to make somebody other than the one God the centre of his attention. And it is the natural consequence of its meaningfulness that it should meet a meaningful end. In this way, the system governing the universe provides arguments in favour of both the unity of God (tawhid) and the existence of the Hereafter.