How do I know that loving life is not a delusion? How do I...

How do I know that loving life is not a delusion? How do I know that in hating death I am not like a man who, having left home in his youth, has forgotten the way back?...someday there will be a great awakening when we know that this is all a great dream. Yet the stupid believe that they are awake, busily and brightly assuming they understand things, calling this man ruler, and that man a herdsman- how dense!