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I.e., without meaning or purpose (cf. 21:16 ) - implying that if there were no hereafter, man's life on earth would be utterly meaningless, and thus in contradiction to the above as well as the subsequent statement, "none of all this have We created without [an inner] truth".
Cf. xxi. 16, and n. 2676. All creation is for a wise and just purpose. But men usually do not realise or understand it, because they are steeped in their own ignorance, folly, or passions.