Cardinals from around the world began arriving in Rome tonight to mark the 25th anniversary of Pope John Paul II's papacy and for meetings that some see as an anticipation of the conclave that will elect his successor.
With concern rising over the frail health of the 83-year-old pontiff, cardinals see the anniversary as a moment to pay tribute to John Paul's determination to press ahead.
English Cardinal Cormac Murphy-O'Connor said he and his fellow prelates were happy to attend the celebrations and recognize "yes, his frailty, but also his indomitable will to carry on and serve the Church as long as God permits him to do so."
John Paul, suffering from Parkinson's disease and knee and hip ailments, kept up his schedule, meeting with the president of Uruguay and several prelates.
Defying skeptics, he also suggested that his days as the most-traveled pontiff in history may not be over.
In a message to Catholic groups from across eastern Europe meeting in Ukraine, John Paul appeared to leave the issue open, saying "Providence alone knows whether I shall be able to continue my pastoral pilgrimages in your blessed lands."
John Paul has received invitations from Austria, Switzerland, France and his native Poland for visits next year, but has not made any commitments.
The main anniversary Mass is Thursday evening in St. Peter's Square, while the cardinals begin their closed-door sessions the previous day.