Dietrich Bonhoeffer, once said it something like this. If you board the wrong train that’s heading in the wrong direction it does you no good to run down the corridor of the train in the opposite direction. At some point you’ve got to get off the train and start walking in the right direction.
The message of Jesus at the beginning of His ministry was “repent, the Kingdom of God is here”. Repent means to turn or to get off the train and walk in the right direction. Luther said that when Jesus said to repent he meant that our entire life is to be one of repentance.