His clinical condition is “complex,” the Vatican said.

The pope also extended his greetings to the thousands of artists who had come to celebrate their Jubilee in Rome this weekend.

To facilitate his recovery, doctors have prescribed that he observe “total rest,” the Vatican press office announced.

The announcement came as Francis was in his bed in the Gemelli Hospital being treated for an infection of the respiratory tract. A Vatican spokesman said "the Holy Father passed a good night and slept well.”

Cancellations announced by the Vatican suggest the pope will be hospitalized for several days.

To understand the significance of the Jubilee and its seven-centuries-old tradition in the Catholic Church, it is necessary first to recall its biblical origins and the historical events that have shaped it.

The letter also stated that Francis disagrees with identifying the illegal status of migrants with criminality, and called on the bishops “to walk together” and defend the human dignity of the migrants in their country.

As the United States and China vie for primacy in the field of artificial intelligence, the Vatican today issued a wide-ranging reflection on “the relationship between Artificial Intelligence and Human Intelligence.”

Pope Francis sent “cordial greetings” and “assurance of my prayers” to Donald J. Trump on Jan. 20, the day of his inauguration as the 47th president of the United States.

Pope Francis expressed the hope that the ceasefire between Israel and Hamas that came into effect on Sunday, Jan. 19, “would be respected immediately by all the parties [involved]” and would lead to “the release of all the hostages” and the rapid provision of urgently needed humanitarian aid to the population of Gaza.