4 Upon the occasion of Our Sacerdotal Jubilee, We allowed that event, so blessed in its memories, to be celebrated with some solemnity, and We even encouraged with fatherly gratification the marks of filial affection which came to Us from every part of the globe. Our reason was that We regarded this celebration not so much as a homage to Our Person, as a dutiful tribute of honor to the dignity of the priestly character.
Source: Ad Catholici Sacerdotii (Vatican.va)