I once heard a story about an older woman who reprimanded her priest for giving communion to young children. “Father,” she said, “you can’t give them communion. They don’t understand what happens!”
To which the priest replied: “Mrs. McGuillecudy, I don’t understand what happens!”
I think of that story often as I read about—and participate in—the conversation in the Episcopal Church about the relationship between communion and baptism.
Knowledge is not a pre-condition for receiving the Eucharist—Baptism is. At the same time, children and adults alike need on-going catechesis to lead them deeper into the mystery of which they partake.