Don't work for the food which perishes, but for the food which remains to eternal life, which the Son of Man will give to you. For God the Father has sealed him."
Hence it follows that the desire of those who shall present their souls to Christ, to be fed by him, will not be disappointed. Let us know, therefore, that life is exhibited to us in Christ, in order that each of us may aspire to it, not at random, but with certainty of success. We are, at the same time, taught that all who bestow this praise on any other than Christ are guilty of falsehood before God. Hence it is evident that the Papists, in every part of their doctrine, are altogether liars; for as often as they invent any means of salvation in the room of Christ, so often do they — by erasing, as it were, the impression which has been made — spoil and deface, with wicked presumption and base treachery, this seal of God, which alone is authentic. That we may not fall into so dreadful a condemnation, let us learn to keep pure and entire for Christ all that the Father has given to him. 