John 10:26

But ye believe not, &c. Ye will not submit to Me as your Shepherd, and accept Me as your Messiah. But ye rather wish Me to submit Myself to you, and to be My superiors, censors, and calumniators. It is ambition which makes you grudge Me the headship of the Church; and that ye refuse to believe Me. S. Augustine by "sheep" understands the elect. But this is not the proper nor the adequate cause of their rejecting Christ. For reprobation is not the cause, but rather the result of unbelief and sin. It was not that God had cast off the Jews that they sinned by unbelief. But it was because they chose to disbelieve and sin, that God cast them off. And it was not an adequate cause, because many of them who disbelieved in Him, believed in Him afterwards through the preaching of the apostles. And again some then believed in Christ who were not predestinated, but afterwards fell away into sin, as Judas and others. Ver. 27. My sheep hear my voice. He leaves the inference to them: but ye hear not my voice, and are therefore not My sheep. (See above, ver. 4.) Ver. 28. And I give unto them eternal life. The sheep of Christ are of two kinds: first, all Christians; and secondly, those alone who are predestinated to glory. The words of Christ relate to the second class. And S. Augustine shows why they do not perish. For they are of those sheep of whom it is said, "The Lord knoweth who are His." They are specially the sheep of Christ, none of whom perish. And yet of the former class Christ also says, "I give unto them eternal life," that is, as far as I may. I make them the promise. I give them all necessary helps. I wish for their salvation. If then any of them perish it is not My fault but theirs, for they will not co-operate with My grace. For neither the devil nor any one else is able to pluck them out of My hand, if they resolve to abide in it, and will not be torn away. For My grace, if they cooperate with it, has power to keep them from being taken from Me. But if they leave Me of their own will, it is not a tearing away, but their own voluntary act. So S. Cyril, Leontius, Theophylact, and Maldonatus. Christ means to say that no power can take them away, but they have full liberty to go away from Christ.

I give unto them eternal life, that is if they abide in faith and obedience to Me. I give it in this world through grace by hope, and I will hereafter give it in glory. He invites the Jews by this promise to become His sheep, and reproves them for refusing to do so. The faithful are in the "hand," that is under the protection and guardianship of Christ. This is signified by the hand, which ministers to the whole body (see S. Isidore, Etym. xi. 1).