Scripture plainly teaches, that practice is the best evidence of the sincerity of professing Christians; so reason teaches the same thing. Reason shows, that men's deeds are better and more faithful interpreters of their minds, than their words. The common sense of all mankind, through all ages and nations, teaches them to judge of men's hearts chiefly by their practice, in other matters: as, whether a man be a loyal subject, a true lover, a dutiful child, or a faithful servant.