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By "calling to witness", certain natural phenomena which are familiar to man because of their permanent recurrence, attention is drawn to the fact that what we call "laws of nature" are but the observable elements of God's plan of creation - a plan in which His revelations (referred to in this and the subsequent verses) play a decisive role: and so, by implication, the divine writ granted to Muhammad is as intrinsically "natural" as any other phenomenon, concrete or abstract, in the realm of God's creation.
They are told here that all their three theories were foolish. The Revelation was really from Allah. Their wonder should cease if they observe the daily miracles worked round them in nature. The bringer of Allah's Message was the angel Gabriel, and not an evil spirit.