We entreat you, brothers, as earnestly as we are able, to have charity, not only for one another, but also for those who are outside the Church. Of these some are still pagans, who have not yet made an act of faith in Christ. Others are separated, insofar as they are joined with us in professing faith in Christ, our head, but are yet divided from the unity of his body. My friends, we must grieve over these as over our brothers; and they will only cease to be so when they no longer say Our Father.
St Augustine of Hippo, bishop, Commentary on the Psalms
Rembrandt van Rijn, “St. Jerome at Prayer” (1635).