89 This collaboration of the laity with the priesthood in all classes, categories and groups reveals precious industry and to the laity is entrusted a mission than which noble and loyal hearts could desire none higher nor more consoling. This apostolic work, carried out according to the mind of the Church, consecrates the layman as a kind of "Minister to Christ" in the sense which Saint Augustine explains as follows: "When, Brethren, you hear Our Lord saying: where I am there too will My servant be, do not think solely of good bishops and clerics." You too in your way minister to Christ by a good life, by almsgiving, by preaching His Name and teaching to whom you can. Thus every father should recognize that it is under this title that he owes paternal affection to his family. Let it be for the sake of Christ and for life everlasting, that he admonishes all his household, teaches, exhorts, reproves, shows kindness, corrects; and thus in his own home he will fulfill an ecclesiastical and in a way an episcopal office ministering to Christ, that he may be for ever with Him" (on The Gospel according to Saint John, tract 51, n. 13).
Source: Summi Pontificatus (Vatican.va)