Jerome here told the truth that eyes tell everything about the secrets of a human that he keeps in his heart. Therefore, if someone can read others eyes then he can unlock his secrets too. People faces also told the action that are planned in the mind.
St. Jerome was a priest, confessor, theologian and historian. He was the son of Eusebius, born at Stridon, a village near Emona on the border of Dalmatia and Pannonia, then part of northeastern Italy.