3 For the Lord heard the thoughts of the Pharisee. Let now the Pharisee understand even by this, whether He was not able to see her sins, who could hear his thoughts. So then He put forth to the man a parable concerning two men, who owed to the same creditor. For He was desirous to heal the Pharisee also, that He might not eat bread at his house for nought; He hungered after him who was feeding Him, He wished to reform him, to slay, to eat him, to pass him over into His Own Body; just as to that woman of Samaria, He said, “I thirst.”
What is, “I thirst”? I long for your faith. Therefore are the words of the Lord in this parable spoken; and there is this double object in them, both that that inviter might be cured together with those who ate at the table with Him, who alike saw the Lord Jesus Christ, and were alike ignorant of Him, and that that woman might have the assurance her confession merited, and not be pricked any more with the stings of her conscience. “One,” said He, “owed five hundred denarii, and the other fifty; He forgave them both: which loved him most?”
He to whom the parable was proposed answered, what of course common reason obliged him to answer. “I suppose, Lord, he to whom he forgave most. Then turning to the woman he said unto Simon, Do you see this woman? I entered into your house, you gave Me no water for My feet: she has washed My feet with tears, and wiped them with her hairs. You gave Me no kiss: this woman since the time she came in, has not ceased to kiss My feet. My head with oil you did not anoint: but this woman has anointed My feet with ointment. Therefore I say, her many sins are forgiven her, for she loved much. But to whom little is forgiven, the same loves little.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)