وَالْخَيْلَ وَالْبِغَالَ وَالْحَمِيرَ لِتَرْكَبُوهَا وَزِينَةً ۚ وَيَخْلُقُ مَا لَا تَعْلَمُونَ (8)
(16:8) He has created horses, mules and donkeys so that you may ride them, and they may add splendour to your life. He creates for you many other things, of which you have no knowledge at all. *8
*8) That is, "There are many agencies which are working for the good of man but he is quite unaware of such servants and the services rendered by them" .