Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 20:9-18

“Now He said this, not as ignorant that they would treat Him worse than they did the prophets, but because the Son ought to be reverenced by them. But if they should still be rebellious and slay Him, this would crown their iniquity. Lest therefore any should say that the Divine Presence has necessarily been the cause of their disobedience, He uses purposely this doubtful mode of speech.”