Except it be given him of the Father (εαν μη η δεδομενον αυτω εκ του πατρος). Condition of third class with εαν μη and periphrastic perfect passive subjunctive of διδωμ. Precisely the same point as in verse John 6:44 where we have ελκυση instead of η δεδομενον. The impulse to faith comes from God. Jesus does not expect all to believe and seems to imply that Judas did not truly believe.