`` teach me , teach me everything , '' gregory had said over and over again to flavius and to chrysanthe , and wandering the busy streets of carthage , filled now with a melange of romans and greeks and vandals , he struggled to explain to his two devoted teachers how astonishing was the wealth of this world which they took for granted , where common people had gold in their pockets , and plenty to eat on their tables , and spoke of `` eternal salvation '' as belonging to the most humbly born .