81 Once when a terrible schism was rending the seamless garment of the Church, Bishop Theophilus of Alexandria addressed his sons and brethren with words of pastoral zeal. We take pleasure in addressing these same words to you: "Dearly beloved, we have all been invited to heaven. Let each, then, according to his abilities imitate Jesus, our model and the author of our salvation.
Source: Ad Petri Cathedram (Vatican.va)