Doves, pomegranates, peacocks, grapes, fleurs-de-lys—all of these are symbols of Christian significance. You may be wondering why Christianity has so many symbols to begin with. Well, in the early days of the religion, it was not so safe to go around proclaiming your faith. Folks like the Romans tended to frown on that sort of behavior—right before they fed you to the lions. Symbolism, then, became a way of invoking the Christian faith as a kind of unspoken code. Why do you think the speaker adopts in here, though, long after Christianity is well-established?