Although Jesus had performed so many signs in their presence, they still did not believe in Him.
37. And though he had done so many signs. That no man may be disturbed or perplexed at seeing that Christ was despised by the Jews, the Evangelist removes this offense, by showing that he was supported by clear and undoubted testimonies, which proved that credit was due to him and to his doctrine; but that the blind did not behold the glory and power...
We have here the honour done to our Lord Jesus by the Old Testament prophets, who foretold and lamented the infidelity of the many that believed not on him. It was indeed a dishonour and grief to Christ that his doctrine met with so little acceptance and so much opposition; but this takes off the wonder and reproach, makes the offence of it to cease...
Commenting on John 12:37-41
That the saying of Esaias the prophet might be fulfilled,.... For though this was not the end of these men in disbelieving Christ, that the words of Isaiah might be fulfilled, yet hereby they were eventually fulfilled; and though the predictions of the prophet had no such influence on the wills of these men, as to lay upon them a coactive necessity, or force them...