The first recorded words of Jesus are in the Gospel of Mark: "Repent and believe in the gospel."
The Greek word Jesus used was metanoia. And the literal meaning of metanoia is "a change of mind." A variation of the same Greek word describes the change a caterpillar goes through to become a beautiful butterfly. Being a Christian is not about following a set of rules; it is about being transformed by God's love and then sharing the beauty of it.
Søren Kierkegaard expressed the energy of "metanoia" this way:
"Don’t just be a Christian. No, take all of your life to become a Christian: Choose, again and again with each new day, to be a real self, an authentic person in relation to God. Abandon your calculated safety for a reckless, wholehearted life of faith in Christ. Continue to become. Grow. Risk. Take that radical leap of faith right now."