In the second place, it is proved by the nature of the head. For it is the nature of every head joined to a body to infuse into all its members life and feeling and activity. This will be found to be true of the heads in worldly affairs. For the ruler of a country instils into his subjects all the things which are in his own mind and will, and causes all his subjects to be of like mind and will with himself, and thus they do the work he wishes to have done, and this work is truly said to have been instilled into the subjects by the prince, for without him it would not have been done. Now no man can instil into the soul of another, nor into his own soul, true faith, and the mind, will and work of Christ, but this Christ Himself must do. For neither pope nor bishop can produce faith in a man's heart, nor anything else a Christian member should have. But a Christian must have the mind and will which Christ has in heaven, as the apostle says, I. Corinthians ii [1. Cor. 2:16; 3:23]. It may also happen that a Christian member has the faith which neither pope nor bishop has; how then can the pope be his head? And if the pope cannot give to himself the life of the spiritual church, how can he instil it into another? Who has ever seen a live animal with a lifeless head? The head must give life to the body, and therefore it is clear that on earth there is no other head of the spiritual Christendom but Christ alone. Moreover, if a man were its head here below, Christendom would perish as often as a pope dies. For the body cannot live when the head is dead. It follows further, that in this Church Christ can have no vicar, and therefore neither pope nor bishop is Christ's vicar or regent in this Church, nor can he ever become such. And this is proved as follows: A regent, if obedient to his lord, labors with and urges on the subjects and instils into them the same work which his lord himself instils, just as we see in temporal government, where there is one mind and will in lord, regents, and subjects. And if he were more holy than St. Peter, the pope can never instill into or create in a Christian man the work of Christ his Lord, i. e., faith, hope, love, and every grace and virtue.