The Quran enjoins the acceptance of the one and only God. Those who do not believe in God advance the argument that if God is in existence, He should be visible to everyone. But our known universe shows that a thing’s invisibility does not prove that it has no existence at all. An example of this is the force of gravity. There are innumerable stars and many planets in space. Human knowledge claims that in between these astronomical bodies there is an ethereal and intangible force of gravity (or force of attraction) which is balancing them in the vastness of space. So man believes in the force of gravity in spite of its being intangible and unseen. Then how can he be justified in denying the existence of God, simply because of His being unseen? This is the case with Revelation and prophethood. When an observer of the universe studies its phenomena, he finds that everything here functions according to a system. It appears as if all things are bound by a special order. This ‘order’ does not exist in the things themselves. Certainly, it comes from outside. In other words, the whole universe seeks instruction from ‘outside’ for its working. This external instruction in the case of our world (leaving out of account its human population) is generally referred to as the Law of Nature. In the case of human beings, this external instruction, or guidance, comes in the form of revelation and inspiration. The Universe is, so to say, a machine and the Quran is its ‘Guide Book’. The former is the example of God’s regulation of affairs and the latter is the example of God’s detailing of signs. There is perfect consistency between these two. Whatever exists in the universe in physical form, exists in the Quran in verbal form. This consistency simultaneously proves two things—first, that there is a Creator of this universe and second, that the Quran is the Book of that Creator and not the creation of the limited mind of a human being.