This is the statement of one who actually saw it--and his statement may be relied upon, and he knows that he is speaking the truth--and it is given in order that you also may be convinced.
He it is whose Coming was attested by means of Water and Blood--Jesus Christ himself; not by Water only, but by Water and by Blood. And there is the Spirit also to bear testimony, and the Spirit is Truth itself.
Every one has always had a good word for Demetrius, and the Truth itself speaks for him. Yes, and we also add our good word, and you know that what we say about him is true.