God forsakers and cistern makers

Four contrasts between the fountain of living waters (God)and all the broken cisterns (man-made idols). (1) There is one all-sufficient fountain but many insufficient cisterns; (2) The fountain is free but the cisterns have to be dug out; (3) The fountain is full but the cisterns are ruptured and leaking; (4) The fountain is pure but the cisterns are stagnant and poisonous.