Philo

Consider how he handled Gen. 2:14 (A river flowed through Eden and watered the garden. From there the river branched out to become four rivers). He determined that the Edenic River represented goodness, while the other four represented the four great virtues of Greek philosophy – prudence, temperance, courage, and justice. In other words, the number four in the biblical text suggested to him four items from Greek philosophy.

William Klein, Introduction to Biblical Interpretation (Dallas: Word, 1993), 26.