Which he shed on us abundantly through Jesus Christ our Saviour. — In other words, which — namely, the Holy Ghost — the Father poured abundantly on us through Jesus Christ cur Saviour. The argument continues thus: He (God) saved us first by the laver of regeneration and of renewal of the Holy Ghost, which God — he proceeds to say — shed (or poured out) abundantly on us, and this constant renewal of the Holy Ghost poured out on the heart of each individual believer was owing to the mediation of Jesus Christ, without whose blessed atonement this effusion of the Holy Spirit never had taken place. In this verse the several operations of each of the Persons of the blessed Trinity are clearly set forth.
It is the Father who is ever pouring out upon us the Holy Ghost. It is owing to the Son’s atonement and intercession that this blessed outpouring takes place at all. It is the Holy Ghost poured out on us abundantly who builds us up in the new life, and trains us for the glories of eternity. Here the “Son” is given the same title of “Saviour,” which, in the preceding verse (Titus 3:5), was applied to the “Father.” The appellation belongs to both the First and Second Persons of the blessed Trinity, inasmuch as the Father may be said to have been the architect of our salvation, while the Son was its builder.