Fresco, 86.6x90.6 in. (220x230 cm.)
Church of Saint Augustine, Gimigniano, Italy
In Augustine's Confessions, he hears a boy chanting tolle, lege, tolle, lege ("take and read," "take and read"). He opens the Bible to Romans 13:14, "Put ye on the Lord Jesus Christ, and make not provision for the flesh, to fulfill the lusts thereof." This leads him to his final decision to become a Christian. The young man on the right could be any one of the companions who also converted. (They go by different names in Ryan's translation and in Caxton's.)
Read more about images of St. Augustine.
Source: this page at Wikimedia Commons.