οὐδεὶς δύναται. See on Joh 6:44; Joh 6:37. The necessity for the internal preparation, the drawing by the Father, was strongly shewn in the case of Judas, who would be still more alienated by Christ’s refusal to be made a king (Joh 6:15) and by the σκληρὸς λόγος (Joh 6:60). The ἐκ indicates the Father as the source of conversion; except it have been given him from the Father: comp. Joh 3:27.