Above all, you must pray for the whole people: that is, for the whole body, for every part of your mother the Church, whose distinguishing feature is mutual love. If you ask for something for yourself then you will be praying for yourself only – and you must remember that more grace comes to one who prays for others than to any ordinary sinner. If each person prays for all people, then all people are effectively praying for each.
— Saint Bruno (1030-1101)