13. two evils--not merely one evil, like the idolaters who know no better; besides simple idolatry, My people add the sin of forsaking the true God whom they have known; the heathen, though having the sin of idolatry, are free from the further sin of changing the true God for idols (Jer 2:11).
      forsaken me--The Hebrew collocation brings out the only living God into more prominent contrast with idol nonentities. "Me they have forsaken, the Fountain," &c. (Jer 17:13; Ps 36:9; Joh 4:14).
      broken cisterns--tanks for rain water, common in the East, where wells are scarce. The tanks not only cannot give forth an ever-flowing fresh supply as fountains can, but cannot even retain the water poured into them; the stonework within being broken, the earth drinks up the collected water. So, in general, all earthly, compared with heavenly, means of satisfying man's highest wants (Isa 55:1, 2; compare Lu 12:33).

JFB.