Pope Francis was hospitalized on Feb. 14 after suffering a bout of bronchitis for weeks and after increasingly finding it hard to speak publicly.

The 88-year-old pope has remained stable, with no fever and good oxygen levels in his blood for several days, doctors said.

Pope Francis issued a message Sunday thanking volunteers for the “miracle of tenderness” they offer the sick, as he continued his recovery from double pneumonia and doctors reported positive news. After more than three weeks in the hospital,