The holy Trinity, the one true God, is of its nature unity, equality and love, and by one divine activity sanctifies its adopted sons. That is why Scripture says that God’s love has been poured into our hearts by the Holy Spirit he has given us. The Holy Spirit, who is the one Spirit of the Father and the Son, produces in those to whom he gives the grace of divine adoption the same effect as he produced among those whom the Acts of the Apostles describes as having received the Holy Spirit. We are told that the company of those who believed were of one heart and soul, because the one Spirit of the Father and the Son, who with the Father and the Son is one God, had created a single heart and soul in all those who believed… God makes the Church itself a sacrifice pleasing in his sight by preserving within it the love which his Holy Spirit has poured out. Thus the grace of that spiritual love is always available to us, enabling us continually to offer ourselves to God as a living sacrifice, holy and pleasing to him for ever.