Luke had already in his Gospel described the miracles and teaching of Jesus to his audience. In the Book of Acts, he confirms the resurrection of Christ, and and that he presented himself to his apostles. Jesus told them not to depart, so they may recieve the Holy Spirit. We too, should not depart from the presence of God, that we may always be receptive to His promised Spirit. The apostles were persistent in asking the Lord about the restoration of Israel, as they had before, but Jesus rebuked them. It is not for you to know the times or dates the Father has set by his own authority. Only the Father knows the time, and that knowledge is hidden from us, and it is good for us not to know. Our business is following Jesus and spreading his word, that is our focus. Let us not be distracted from our purpose by seeking what is withheld but seeking what is freely given. But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth. This is our task! The Lord ascended into heaven, and at the time appointed by the Father, he will descend upon us. The apostles faithfully prayed together for guidance, as the task appointed to them was great. We should should pray to our Lord for guidance before we undertake all our tasks. Peter addressed the matter of Judas, and that the Spirit, speaking through David in one of his Psalms, guided the decision to replace Judas, that number of the apostles be returned to its original twelve. Two men were nominated, but the final choice was given to God, and he appointed Matthias. May we ask God to guide all of our choices.