But although He had done so many signs before them, they did not believe in Him, that the word of Isaiah the prophet might be fulfilled... Therefore they could not believe, because Isaiah said again:

“He has blinded their eyes and hardened their hearts, lest they should see with their eyes, lest they should understand with their hearts and turn, so that I should heal them.”  

These things Isaiah said when he saw His glory and spoke of Him.

Nevertheless even among the rulers many believed in Him, but because of the Pharisees they did not confess Him, lest they should be put out of the synagogue; for they loved the praise of men more than the praise of God.

John 12:37-43 (NKJV)