Matthew 4:17

From that time Jesus began to preach and say, “Repent (change your inner self-your old way of thinking, regret past sins, live your life in a way that proves repentance; seek God’s purpose for your life), for the kingdom of heaven is at hand.    

The old way of thinking always needs an update.  Just like our lives move forward, so should our faith by renewing our thinking.  Growing continually takes up more space, and so should the word in our lives and mind.  As the mind updates, so do the way we live and how we see our purpose.