When we are baptized, we begin a new life. The life we have lived up to that time comes to an end - it is a thing of the past. Such a change is only possible through the grace of God. Being children of our Father in heaven, we can come to Him through Jesus. We shall fail often as we try to please Him, but when we ask for forgiveness, He will hear us for Jesus' sake.
Food is essential for growth.
And those who are born to a new life by baptism can only grow in Christ if the new life is fed and nourished by God's Word. God wants to give us eternal life in His Kingdom. And so He is preparing us now for that life. He wants us to be there, and He will help us in every possible way. He has given Jesus to help us, and through Jesus we can come to Him in prayer.