(45:5) and in the succession of night and day, *4 and in the provision *5 that Allah sends down from the sky wherewith He gives life to the earth after it had been lifeless, *6 and in the change of the winds: *7 (in all these) there are Signs for people who use reason.

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*4) The difference of the night and day is a sign because one follows the other with full regularity, because one is bright and the other dark, because over a certain period the day goes on shortening and the night lengthening gradually till the two become equal in duration, then again the day goes on lengthening and the night shortening till the two again become equal in duration. These different kinds of variations found in the night and the day and the great aspects of wisdom that accrue from these, arc a clear pointer to the fact that the Creator of the sun and the earth and of every thing on the earth is one and that one AII-Powerful Being is keeping both these spheres under His control; that that Being is not deaf and blind and unwise but All-Wise, Who has established this unalterable system and made His earth a suitable place for the countless species of life, which He has created here in the form of vegetables, animals and men. (For explanation, see Yunus: 67, An Naml: 86, Al-Qasas: 71-73, Luqman: 29 and E.N. S0, Ya Sin: 37 and E.N. 32)
*5) "Provisions": rainfall as becomes evident from the following sentence.
*6) For explanation, see Al-Mu'minun: 18-20, Al-Furqan: 48-49, AshShu'ara': 7, An-Naml: 61, Ar-Ruth: 24, 48, Ya Sin: E.N.'s 26 to 31.
*7) The circulation of the winds implies the circulation of the different kinds of winds at different times, on different parts of the earth and at different heights, which cause change of the seasons. What deserves attention is not only that above the surface of the earth there is a thick atmosphere, which contains all those elements needed by living beings for breathing, and this thick covering has kept the earth's population safe from many of the heavenly calamities. Besides, another noteworthy thing is that the air is not just filled inertly in the atmosphere, but it blows occasionally in different ways. Sometimes a cool wind blows and sometimes a hot wind; sometimes it stops blowing and sometimes it starts blowing; sometimes it blows soft and sometimes strong, and sometimes it assumes the proportions of a storm, sometimes a dry wind blows and sometimes a moist wind; sometimes it brings the rain and sometimes it drives away the clouds. These different kinds of the winds do not blow without a purpose, but under a law and a system, which testifies that this arrangement is based on perfect wisdom, and it is serving great objectives. Then it is deeply related with coolness and heat, which go on increasing and decreasing according to the changing conditions and relationships between the earth and the sun. Furthermore, it has a deep relation with the seasonal changes and the distribution of the rain. All these facts proclaim that these arrangements have not been made haphazardly by some blind nature, nor have the sun and the earth and the air and water and vegetation and animals separate controllers, but inevitably One God alone is the Creator of them aII, and it is His Wisdom that has established this system for a great objective, and it is His power that it is functioning regularly according to a pre-ordained law.