Charles Ellicott Commentary Luke 18:1

"And he spake a parable unto them to the end that they ought always to pray, and not to faint;" — Luke 18:1 (ASV)

That men ought always to pray, and not to faint.—The latter of the two verbs is noticeable as being used in the New Testament by St. Luke and St. Paul only (2 Corinthians 4:1; 2 Corinthians 4:16; Galatians 6:9; 2 Thessalonians 3:13). The whole verse is remarkable as being one of the few instances (Luke 18:9 being another) in which a parable is introduced by a distinct statement as to its drift and aim.