And when they had nothing to pay, he frankly forgave them both. Tell me therefore, which of them will love him most?

People's New Testament

7:42 Had nothing to pay. The small debtor was as helpless as others. We are all insolvent.

Matthew Henry's Concise Commentary

7:36-50 None can truly perceive how precious Christ is, and the glory of the gospel, except the broken-hearted. But while they feel they cannot enough express self-abhorrence on account of sin, and admiration of his mercy, the self-sufficient will be disgusted, because the gospel encourages such repenting sinners. The Pharisee, instead of rejoicing in the tokens of the woman's repentance, confined his thoughts to her former bad character. But without free forgiveness none of us can escape the wrath to come; this our gracious Saviour has purchased with his blood, that he may freely bestow it on every one that believes in him. Christ, by a parable, forced Simon to acknowledge that the greater sinner this woman had been, the greater love she ought to show to Him when her sins were pardoned. Learn here, that sin is a debt; and all are sinners, are debtors to Almighty God. Some sinners are greater debtors; but whether our debt be more or less, it is more than we are able to pay. God is ready to forgive; and his Son having purchased pardon for those who believe in him, his gospel promises it to them, and his Spirit seals it to repenting sinners, and gives them the comfort. Let us keep far from the proud spirit of the Pharisee, simply depending upon and rejoicing in Christ alone, and so be prepared to obey him more zealously, and more strongly to recommend him unto all around us. The more we express our sorrow for sin, and our love to Christ, the clearer evidence we have of the forgiveness of our sins. What a wonderful change does grace make upon a sinner's heart and life, as well as upon his state before God, by the full remission of all his sins through faith in the Lord Jesus!