Surah 16. An-Nahl

60It is to emphasize this: Allah not only provides you with the necessities and good things of life (as stated in the preceding verses), but also has full power over your life and death. None else has any power to give lift or cause death.

61This fact has been mentioned to bring home to the disbelievers and the mushriks that knowledge, which gives superiority to man over all creatures on this Earth, has been given by Allah, as if to say, "You yourselves have seen that when a man, who once possessed much knowledge, becomes very old, he is reduced to a mere lump of flesh. Then that man who once taught knowledge to others loses all his senses and cannot look even after his own self."