What is the moral of story the old man and the sea

From the book the Old Man and the Sea, several morals are observed. For instance, Santiago demonstrates persistence in his fishing endeavor. Despite going for more than eighty days without a single catch, each evening going home empty-handed, Santiago does not relent and still goes out to fish. Humility is also shown when Santiago accepts Manolin's kindness. He put aside his pride and accepted assistance from a young boy that pitied him. Manolin portrays loyalty by ensuring that Santiago has enough to eat. He also ensures that Santiago has fresh bait for his lines, going to the extent of stealing or begging to make sure the above needs are met. He does all this despite his father's advice to stop associating with Santiago. Santiago demonstrates patience by pursuing the marlin overnight, waiting for it to tire. He is resourceful, eating raw tuna. He also consumes water carefully not to exhaust it, aware that he is long way from shore.