John Chrysostom — as excerpted in the Catena Aurea on Matthew 12:38-40

“But their words are full of hypocrisy and irony. But now they were railing against Him, saying that He had a dæmon; now they fawn upon Him, calling Him, Master. Wherefore the Lord rebukes them severely; He answered and said unto them, An evil and adulterous generation seeketh after a sign. When they railed on Him, He had answered them mildly; now they approached Him with smooth and deceitful words, He rebukes them sharply; shewing that He was above either affection, and was neither moved to anger by evil speaking, nor was to be gained by flattery. What He says is this; What wonder that ye do thus to Me who am unknown to you, when you have done the same to the Father, of whom ye have had such large knowledge, in that, despising Him ye went after dæmons? He calls them an evil generation, because they have ever been ungrateful to their benefactors, and were made worse when they received benefits, which is the extreme of wickedness.”