A brief indication of the proof in this is as follows:
The source, master, and basis of The Supreme Sign is the sublime verse:
Say: if there had been [other] gods with Him —as they say— behold, they would certainly have sought out a way to the Lord of the Throne! [to the end of the verse],1
which is also called The Supreme Sign. That is, if God had any partners and others had intervened in creation and interfered in His dominicality, the order of the universe would have been spoilt.” However, the perfect order in everything, small and large, particular and universal, from the wing of the tiniest fly and the cell of the pupil of the eye to the numberless birds which fly through the air and the solar system, furnishes indubitable and decisive evidence for the impossibility and non-existence of any such partners. It also testifies self-evidently to the existence and unity of the Necessarily Existent One.
A concise indication of the lengthy proof contained in this phrase:
We see that behind the veil One of boundless power and knowledge makes the face of the earth into an arable field, and every spring sows in it all mixed up together the seeds of a hundred thousand species of plants. Then in perfect order without confusing any of their crops, He raises them and with the hand of mercy and wisdom, out of them distributes to the two hundred thousand animal species their sustenance and rations according to need. He performs these acts of disposal in His vast, rich dominions, especially on the face of the earth. Those, then, who do not recognize that All-Wise Disposer and Compassionate Owner are compelled to deny the earth together with its produce, like the foolish Sophists.
This is a very brief indication to the very extensive proof contained in this phrase:
Yes, we see with our eyes and understand clearly with our minds that this city of the universe, quarter of the earth, and barracks of men and animals is governed, supervised, and maintained by an All-Compassionate Provider, a Munificent Provider of Bounties. For in order to have His bounties praised and thanked for, He makes the earth into a merchant ship