Augustine of Hippo — as excerpted in the Catena Aurea on Luke 18:9-14

“(Serm. 115.) His fault was not that he gave God thanks, but that he asked for nothing further. Because thou art full and aboundest, thou hast no need to say, Forgive us our debts. What then must be his guilt who impiously fights against grace, when he is condemned who proudly gives thanks? Let those hear who say, “God has made me man, I made myself righteous. O worse and more hateful than the Pharisee, who proudly called himself righteous, yet gave thanks to God that he was so.”