Ideas about the Kingdom of the Heavens around us and the unity of believers in Christ within it
Paul’s use of the word “repentance” in Antioch in Pisidia did not directly connect it with obedience. However, his references to the preaching of John the Baptist and to the contrast between Kings Saul and David implied this connection.
Jesus’ early preaching was that his hearers must repent. because the Kingdom had already arrived and was “at hand”–standing right in front of them, in his person. Therefore, they were to repent–change their behavior–and believe the good news (Gospel) he was preaching to them.
As the parable of the two sons in Matthew 21:28-32 shows, repentance is merely changing our minds so that we start to do what the Father asks. Repentance does not require remorse, payment of a penalty, or even in all cases a spoken apology, and the forgiveness that it produces cannot be sold.