1 At the end of the year in which, by a singular mercy of God, We have celebrated the fiftieth anniversary of Our priesthood, We dwell with pleasure upon the past months, and are delighted to recall them to memory. And not without reason; for the occasion, which regarded Us in a personal manner, was of itself neither great nor extraordinary, and yet moved the goodwill of all men to a very great degree, to rejoice with and congratulate Us, so that there was nothing left to be desired.
Source: Exeunte Iam Anno (Vatican.va)