Anyone who has had babies should know that babies are born with self-centeredness, which is the essence of sin. They have to be taught that they aren't the center of their world but that God in Christ is. Romans 1 through 3:20 shows that all people are guilty before God, and Ephesians 2:1-3 shows that we are all born sinners who are dead to God and must be given the new birth as our second birth (verses 4-9) through faith by grace. Then, once he saves us, he calls us to do good works in the power of Jesus' resurrection, which gives us the new birth (Colossians 1:1 [Jesus' resurrection] and the rest of the chapter: Paul's commands to make spiritual progress).