O men , if you are in doubt as to the Uprising , surely We created you of dust then of a sperm-drop , then of a blood clot , then of a lump of flesh , formed and unformed that We may make clear to you . And We establish in the wombs what We will , till a stated term , then We deliver you as infants , then that you may come of age ; and some of you die , and some of you are kept back unto the vilest state of life , that after knowing somewhat , they may know nothing .