In the 1960s, the Kingston Trio released a song called “Desert Pete.” The ballad tells of a thirsty cowboy who is crossing the desert and finds a hand pump. Next to it, Desert Pete has left a note urging the reader not to drink from the jar hidden there but to use its contents to prime the pump.

The cowboy resists the temptation to drink and uses the water as the note instructs. In reward for his obedience, he receives an abundance of cold, satisfying water. Had he not acted in faith, he would have had only a jar of unsatisfying,…