Greek Expositor (anonymous) — as excerpted in the Catena Aurea on Luke 18:9-14

“(Asterius.) To be diligent in prayer was the lesson taught by our Lord in the parable of the widow and the judge, He now instructs us how we should direct our prayers to Him, in order that our prayers may not be fruitless. The Pharisee was condemned because he prayed heedlessly. As it follows, The Pharisee stood and prayed with himself.”