It is to be remarked as to scripture, that Paul declares his doctrine (i.e., of the church) completes it (Col. 1:25), and that (Gal. 1:8, 9) he will not have any gospel besides. It would be ἔτερον, not ἄλλο. Thus we are certain to have the whole truth. The Spirit may apply in grace, may practically develop, so as through him to judge all by.