"God, have mercy on me, a sinner." (Luke 18:13)
Luke explicitly states the purpose of the first parable: Jesus tells it to show them that they should always pray and not give up. A widow comes repeatedly to a judge who neither fears God nor cares about people, pleading for justice against her adversary. The judge finally relents not from justice but from weariness: she will wear me out with her coming. Jesus draws the conclusion: if even an unjust judge grants justice to a persistent widow, how much more will God bring about justice for his chosen ones who cry out to him day and night? Will he keep putting them off? I tell you, he will see that they get justice, and quickly. Then he asks a question that hangs in the air over all the Gospel's teaching on prayer: When the Son of Man comes, will he find faith on the earth?
The Catechism describes persevering prayer as the essential form of the Christian life: not the intensity of the occasional dramatic prayer, but the steady, faithful returning day after day, whether we feel like it or not, whether we sense God's presence or not (CCC 2742). The widow's power is not her eloquence. It is her return.
Two men go up to the Temple to pray. The Pharisee prays about himself: God, I thank you that I am not like other people, robbers, evildoers, adulterers, or even like this tax collector. I fast twice a week and give a tenth of all I get. The tax collector stands at a distance, will not even look up to heaven, beats his breast, and says: God, have mercy on me, a sinner. Jesus says the tax collector went home justified, not the Pharisee. The Pharisee's prayer is technically accurate. He is describing real virtues. But he is comparing himself to others rather than presenting himself before God. The tax collector brings nothing but his need. The prayer of the tax collector has become one of the foundational prayers of the Christian tradition, especially in Eastern Christianity: the Jesus Prayer, Lord Jesus Christ, Son of God, have mercy on me a sinner, is its direct descendant.
A rich ruler asks Jesus how to inherit eternal life. He has kept all the commandments from youth. Jesus looks at him and tells him one thing is missing: sell everything, give to the poor, and come, follow me. The man is very rich and becomes sad. Jesus says it is easier for a camel to go through the eye of a needle. The disciples ask: who then can be saved? What is impossible with man is possible with God. Then blind Bartimaeus cries out from the roadside: Jesus, Son of David, have mercy on me! He receives his sight and follows Jesus. The one who has nothing, crying for mercy, receives everything. The one who has everything, unable to let go, goes away sad.
Brothers and sisters, the tax collector's prayer is one sentence and it is everything: God, have mercy on me, a sinner. You do not need a longer prayer. You do not need a better record. You do not need to compare yourself favourably to anyone. Come before God as the tax collector came: at a distance, head bowed, with nothing to offer but the need. That is enough. It is more than enough.
God, have mercy on me, a sinner. Lord Jesus Christ, Son of the living God, have mercy on me, a sinner. Teach me to pray as the tax collector prayed: without pretence, without comparison, without anything but need. And in that emptiness, fill me with your grace. Through Christ our Lord. Amen.