John Paul II's letter on the Rosary says the first half of the Hail Mary is "drawn from the words spoken to Mary by the Angel Gabriel and by Saint Elizabeth," and that the name of Jesus is its "centre of gravity." The repetition is meant to work the way a refrain does, holding the attention steady while the mind stays on an event in the Gospel. The same letter, quoting St. Paul VI, admits the danger the objection points to: without contemplation the Rosary "runs the risk of becoming a mechanical repetition of formulas." The second half of the Hail Mary ("pray for us sinners") is a request for Mary's prayers, which rests on a different question, answered separately. The Rosary is a devotion, not an obligation; no Catholic is required to pray it, and a guest on a pilgrimage may simply listen.