Mark 8:18

“Having eyes, see ye not? etc..] Meaning perhaps both the eyes of their bodies, and of their understandings: they had bodily eyes, and with them saw the miracles he wrought, and yet took little notice of them; and the eyes of their understandings were enlightened by Christ, and yet saw things but very darkly: and having ears, hear ye not? They had their natural hearing, and yet made but little use of it; and did not so diligently attend to the sound of Christ's words: and though they had spiritual ears given them to hear, yet were very dull of, understanding, and taking in things: and do ye not remember? the interpretation of parables formerly given, and the miracles of the loaves lately…”

“See this passage explained in Matthew 16:1-12. Mark 8:12 Sighed deeply in his spirit - His heart was deeply affected at their wickedness and hypocrisy. The word “spirit” here is taken as the seat of the emotions, passions, affections. He drew groans deeply from his breast. No sign be given - That is, no such sign as they asked, to wit, a sign “from heaven.” He said a sign should be given, the same as was furnished by Jonas, Matthew 16:4. But this was not what they “asked,” nor would it be given “because” they asked it. Mark 8:15 Beware of the leaven of the Pharisees - See Matthew 16:6. Of Herod - Of the Herodians - of Herod and his followers. Matthew, instead of “Herod,” has “the Sadducees.”…”

“see: Mar 4:12; Deu 29:4; Psa 69:23, Psa 115:5-8; Isa 6:9, Isa 6:10, Isa 42:18-20, Isa 44:18; Jer 5:21; Mat 13:14, Mat 13:15; Joh 12:40; Act 28:26, Act 28:27; Rom 11:8 do: Pe2 1:12 Mark 8:19”