Jamieson, Fausset and Brown on Luke 12:16-19

16-19. a certain rich man, &c.--Why is this man called a "fool?" (Lu 12:20) (1) Because he deemed a life of secure and abundant earthly enjoyment the summit of human felicity. (2) Because, possessing the means of this, through prosperity in his calling, he flattered himself that he had a long lease of such enjoyment, and nothing to do but give himself up to it. Nothing else is laid to his charge.