A frail Pope John Paul II gave thanks Sunday for his 25-year pontificate in opening a week of ceremonies surrounding his papal anniversary amid increasing concerns about his health.

A frail Pope John Paul II gave thanks Sunday for his 25-year pontificate in opening a week of ceremonies surrounding his papal anniversary amid increasing concerns about his health. The 83-year-old pope spoke in a weak and labored voice to the faithful from his studio window overlooking St. Peter’s Square — a day after the Vatican again denied reports he was undergoing kidney dialysis.