1 Dear Theophilus, in the first volume of this book I wrote on everything that Jesus began to do and teach until the day he said good-bye to the apostles, the ones he had chosen through the Holy Spirit, and was taken up to heaven. After his death, he presented himself alive to them in many different settings over a period of forty days. In face-to-face meetings, he talked to them about things concerning the kingdom of God. As they met and ate meals together, he told them that they were on no account to leave Jerusalem but "must wait for what the Father promised: the promise you heard from me. John baptized in water; you will be baptized in the Holy Spirit. And soon."