Indeed, in the testimony of faith, three answers can be given to the question of when I became a Christian. Firstly, I have been a child of God from all eternity in the heart of the Father. Secondly, I became a child of God when Christ the Son lived, died and rose again for me long ago. Thirdly, I became a child of God when the Holy Spirit – the Spirit of adoption – sealed in my faith and experience what had been planned from all eternity in the heart of the Father and what was completed once and for all in Jesus Christ. There are three moments but only one act of salvation, just as we believe there are three persons in the Trinity, but only once God. We may never divorce any one from the other two. So Jesus commissioned the disciples to preach the gospel and to baptize “in the name of the Father and of the Son and of the Holy Spirit.” Of these three moments, the second is the decisive one in the gospel of grace. Christus pro nobis prior to Christus in nobis. “Little child, for you Jesus Christ has come.”
James B. Torrance, Worship, Community & the Triune God of Grace (76)