Isaiah 29:13-14

13, 14. Thus spiritual teaching is rejected, though formal adherence may be observed. In this way moral blindness is self inflicted. It follows the law which God has established, that, abusing so delicate a thing as conscience, it must be blinded. They keep up the form of sacrifice and worship in Jerusalem, not from heart-assent to it, but because Hezekiah, the truly pious king at this time, has prohibited idol worship absolutely. They see no help against Assyrian invasion but from Egypt. So spiritual a thing as help from Jehovah alone they cannot appreciate.

A marvellous work and a wonder Our Lord quotes these words as applying to the scribes and Pharisees. Matthew 15:7-9. Does Isaiah forecast the times of Christ? Yes, by stating a law of the Spirit and conscience applicable on the same point at all times. Perverting truth is followed by blindness always.