Spirit in Acts is never achieved or “obtained” (cf. Acts 8:19–20 ktasthai!), he is always a present, i.e., he is the Spirit of God. Therefore, here at the opening of Acts Luke gives the Spirit the name by which he is rightly to be understood in the remainder of the book: he is “the promise of the Father.” Jesus continued by reminding the apostles that they had heard of this promise from him and that “John baptized with water, but before many days you shall be baptized with the Holy Spirit” (v. 5).