One night Abraham was looking up at the sky in search of signs of the one and only God. Soon, the planet Venus, whom his community was worshipping as God, appeared shining before him in all its brightness. A thought arose in his mind—not as a question, but as an expression of astonishment— ‘Is this the thing which could be my Lord? Is this the one we should worship?’ But then, he saw it setting, i.e. disappearing from his sight. He exclaimed over this and asked how a thing which shone momentarily and then disappeared could be treated as worthy of worship. This was an argument based on observation which testified to the truth of his own belief. He had the same experience with the sun and the moon. Everything shines for some time, leaves people wonderstruck and then vanishes. He presented these astronomical observations (which were for him a clear verification of the principle of the unity of God) before his community in his preaching as an argument, adopting the method which is known in philosophical terminology as ‘accusative logic’, that is, repeating the words of the addressee and then convincing him. This method has been used in the Quran at other places also, for example, in verse 97, chapter 20, entitled, Ta Ha. The signs of creation spread throughout the universe are not only a source of enhancement of Faith, but also provide strong arguments for the call for Truth.