John Chrysostom

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He not only requires faith which is of the mind, but confession which is by the mouth, that He may exalt us higher, and raise us to a more open utterance, and a larger measure of love. For this is spoken not to the Apostles only, but to all; He gives strength not to them only, but to their disciples. And he that observes this precept will not only teach with free utterance, but will easily convince all; for the observance of this command drew many to the Apostles.