Adam Clarke on Genesis 41:25

God hath showed Pharaoh what he is about to do - Joseph thus shows the Egyptian king that though the ordinary cause of plenty or want is the river Nile, yet its inundations are under the direction of God: the dreams are sent by him, not only to signify beforehand the plenty and want, but to show also that all these circumstances, however fortuitous they may appear to man, are under the direction of an overruling Providence.