“What do you think? There was a man who had two sons. He went to the first and said, “Son, go and work today in the vineyard.”
“I will not,” he answered, but later he changed his mind and went.
“Then the father went to the other son and said the same thing. He answered, “I will, sir,” but he did not go.
“Which of the two did what his father wanted?”
“The first,” they [the chief priests] answered.
Jesus said to them, “I tell you the truth, the tax collectors and the prostitutes are entering the kingdom of God ahead of you. For John came to you to show you the way of rightousness, and you did not belive him, but the tax collectors and the prostitutes did. And even after you saw this, you did not repent and believe him.” Matthew 21:28-32 (The Parable of the Two Sons).
This is a simple parable that Jesus used to show “the chief preists and elders of the people”, who were so legalistic, that those who believe will enter the kingdom of God, even if they continue to sin. Yet those who don’t believe, even if they follow the law (what the Father wanted), will not.
In other words, it is not what you do; it is what you believe. You cannot earn your way to heaven no matter how much you do on this earth. Jesus comes to each of us asking us to simply believe in him. Do you?