Charles Ellicott Commentary John 12:37

"But though he had done so many signs before them, yet they believed not on him:" — John 12:37 (ASV)

But though he had done so many miracles before them.—The words “before them” mean “in their presence,” “before their eyes.” They refer to the multitude (John 12:34). St. John’s narrative implies, therefore, that the “signs” of the earlier Gospels were well known. He has himself recorded only six miracles, and all these, with the exception of the feeding the five thousand, belong to the Judean ministry. (Compare to the note on John 2:11.)

Yet they believed not on him.—This is the writer’s comment on the general result of Christ’s work at the close of His public teaching. This too is said of the multitude, the people as a whole. There were, of course, quite a few who were then walking according to the light they had, but it was not so with the many. Rejection and not acceptance was the result of Christ’s personal work on earth; yet rejection was accompanied, as on this day, by signs that pointed to a worldwide acceptance. He came unto His own, and His own received Him not. But as many as received Him, to them gave He power to become the sons of God, even to them that believe on His name (John 1:11–12).