I need hardly say that the words "_all truth_" in this promise mean all truth relating to our salvation. It is no part of our Lord's plan to teach us the truths of natural science. He leaves us to discover these by our own intelligence. He comes to teach us faith and morals--what we are to believe, and what we are to do, in order to be saved. He did this while He was on earth by His conversations with His disciples, and by His public sermons to the Jews; but He promised that this work should be carried on after His death more extensively and systematically. Thus, in the words of the text: "When He the Spirit of Truth shall come He will lead you into all truth." [Footnote 114] And again: "_The Paraclete, the Holy Ghost, Whom the Father will send in My name, He will teach you all things and will bring all things to your mind whatsoever I shall have said to you_."[Footnote 115] It cannot but be a matter of interest to inquire in what manner this promise has been fulfilled. [Footnote 114: St. John xvi. 13.] [Footnote 115: St. John xiv. 26.] I answer, the Holy Ghost leads us into all truth necessary to our salvation by the public preaching of the Word of God. If we examine our Lord's words attentively, we shall be led to the conclusion that the ministry of the Holy Ghost to which He alludes is a public ministry. His own ministry was a public one, and in promising that the Holy Ghost should carry it on and complete it, He leads us to anticipate that the ministry of the Holy Ghost would also be public. {371} And His own subsequent language shows that this is really so, and acquaints us with the way in which this ministry is to be exercised. Just before our Lord's Ascension He met the Apostles on a mountain in Galilee, and said to them: "_All power is given to Me in heaven and in earth. Go ye, therefore, and teach all nations; baptizing them in the name of the Father and of the Son and of the Holy Ghost; teaching them to observe all things whatsoever I have commanded you; and behold I am with you all days, even to the consummation of the world_." [Footnote 116] August and extensive as this commission was, it did not by itself qualify the Apostles for their great work. They were to wait in Jerusalem "till they were endued with power from on high." This "power" was the Holy Ghost which actually did descend on them at the feast of Pentecost. Here we find a company of men commissioned by Christ to teach the world in His name, and empowered by the Holy Ghost for that purpose. We find these men afterward everywhere claiming to be the organs of the Holy Ghost. Thus, at the council of Jerusalem, they did not hesitate to publish their decrees with this preface: "_It hath seemed good to the Holy Ghost and to us_." [Footnote 117] And St. Paul tells the bishops of Ephesus, that they were placed over the Church "_by the Holy Ghost_." [Footnote 118] [Footnote 116: St. Matt. xxviii. 18-20.] [Footnote 117: Acts xv. 28.]