Cyprian: "What did you just say?"
Me: "I repeated 'Most Sacred Heart of Jesus, have mercy on us' three times."
Cyprian: "Why three times? There are five decades."
Me: "Three is a good number, I guess. There are three Persons in the Holy Trinity, for example."
Cyprian, signing himself and frowning: "No, Daddy, that's not right. There are four of them--Father, Son, Holy, and Spirit."