So Paul stood up and with a gesture began to speak: “You Israelites, and others who fear God, listen. The God of this people Israel chose our ancestors and made the people great during their stay in the land of Egypt, and with uplifted arm he led them out of it. For about forty years he put up with them in the wilderness. After he had destroyed seven nations in the land of Canaan, he gave them their land as an inheritance for about four hundred fifty years. After that he gave them judges until the time of the prophet Samuel. Then they asked for a king; and God gave them Saul son of Kish, a man of the tribe of Benjamin, who reigned for forty years. When he had removed him, he made David their king. In his testimony about him he said, ‘I have found David, son of Jesse, to be a man after my heart, who will carry out all my wishes.’ Of this man’s posterity God has brought to Israel a Savior, Jesus, as he promised; before his coming John had already proclaimed a baptism of repentance to all the people of Israel. And as John was finishing his work, he said, ‘What do you suppose that I am? I am not he. No, but one is coming after me; I am not worthy to untie the thong of the sandals on his feet.’ “My brothers, you descendants of Abraham’s family, and others who fear God, to us the message of this salvation has been sent. Because the residents of Jerusalem and their leaders did not recognize him or understand the words of the prophets that are read every sabbath, they fulfilled those words by condemning him. Even though they found no cause for a sentence of death, they asked Pilate to have him killed. When they had carried out everything that was written about him, they took him down from the tree and laid him in a tomb. But God raised him from the dead; and for many days he appeared to those who came up with him from Galilee to Jerusalem, and they are now his witnesses to the people. And we bring you the good news that what God promised to our ancestors he has fulfilled for us, their children, by raising Jesus; as also it is written in the second psalm, ‘You are my Son; today I have begotten you.’ As to his raising him from the dead, no more to return to corruption, he has spoken in this way, ‘I will give you the holy promises made to David.’ Therefore he has also said in another psalm, ‘You will not let your Holy One experience corruption.’ For David, after he had served the purpose of God in his own generation, died, was laid beside his ancestors, and experienced corruption; but he whom God raised up experienced no corruption. Let it be known to you therefore, my brothers, that through this man forgiveness of sins is proclaimed to you; by this Jesus everyone who believes is set free from all those sins from which you could not be freed by the law of Moses. (Acts 13:16-39, NRSV)
Paul gives us the readers digest history of Christianity here.
He tells us and those present how we have gotten to this point, and that the message was there all along. This is not a new message, that God wants us to turn around and follow Him. He has been telling us this all along. So follow after Jesus, and allow His life to permeate your life.


Therefore let the entire house of Israel know with certainty that God has made him both Lord and Messiah, this Jesus whom you crucified.” Now when they heard this, they were cut to the heart and said to Peter and to the other apostles, “Brothers, what should we do?” Peter said to them, “Repent, and be baptized every one of you in the name of Jesus Christ so that your sins may be forgiven; and you will receive the gift of the Holy Spirit. For the promise is for you, for your children, and for all who are far away, everyone whom the Lord our God calls to him.” And he testified with many other arguments and exhorted them, saying, “Save yourselves from this corrupt generation.” So those who welcomed his message were baptized, and that day about three thousand persons were added. They devoted themselves to the apostles’ teaching and fellowship, to the breaking of bread and the prayers. (Acts 2:36-42, NRSV)

At that very time there were some present who told him about the Galileans whose blood Pilate had mingled with their sacrifices. He asked them, “Do you think that because these Galileans suffered in this way they were worse sinners than all other Galileans? No, I tell you; but unless you repent, you will all perish as they did. Or those eighteen who were killed when the tower of Siloam fell on them—do you think that they were worse offenders than all the others living in Jerusalem? No, I tell you; but unless you repent, you will all perish just as they did.” Then he told this parable: “A man had a fig tree planted in his vineyard; and he came looking for fruit on it and found none. So he said to the gardener, ‘See here! For three years I have come looking for fruit on this fig tree, and still I find none. Cut it down! Why should it be wasting the soil?’ He replied, ‘Sir, let it alone for one more year, until I dig around it and put manure on it. If it bears fruit next year, well and good; but if not, you can cut it down.’” (Luke 13:1-9, NRSV)

ohn said to the crowds that came out to be baptized by him, “You brood of vipers! Who warned you to flee from the wrath to come? Bear fruits worthy of repentance. Do not begin to say to yourselves, ‘We have Abraham as our ancestor’; for I tell you, God is able from these stones to raise up children to Abraham. Even now the ax is lying at the root of the trees; every tree therefore that does not bear good fruit is cut down and thrown into the fire.” And the crowds asked him, “What then should we do?” In reply he said to them, “Whoever has two coats must share with anyone who has none; and whoever has food must do likewise.” Even tax collectors came to be baptized, and they asked him, “Teacher, what should we do?” He said to them, “Collect no more than the amount prescribed for you.” Soldiers also asked him, “And we, what should we do?” He said to them, “Do not extort money from anyone by threats or false accusation, and be satisfied with your wages.” As the people were filled with expectation, and all were questioning in their hearts concerning John, whether he might be the Messiah, John answered all of them by saying, “I baptize you with water; but one who is more powerful than I is coming; I am not worthy to untie the thong of his sandals. He will baptize you with the Holy Spirit and fire. His winnowing fork is in his hand, to clear his threshing floor and to gather the wheat into his granary; but the chaff he will burn with unquenchable fire.” So, with many other exhortations, he proclaimed the good news to the people. (Luke 3:7-18, NRSV)