Roscellinus appears at first to have imagined that his tritheistic theory had the sanction of Lanfranc and Anselm, and the latter was led in consequence to compose his treatise De fide Trinitatis.
Melber, Ueber die Quellen and Werth der Strategemensammlung Polycins (1885); Knott, De fide et fontibus Polyaeni (1883), who largely reduces the number of the authorities consulted by Polyaenus.
His work De Fide has been preserved in connexion with a refutation written by Epiphanius (Haer.
Not only does the correction involve the substitution of papal authority for a universal consent of " pastors " and " the faithful "; it also deliberately ranks the unformulated teachings of the church on points of doctrine as no less de fide than those formulated.
What he finds it necessary to condemn even in milder terms as bad doctrine is infallibily condemned; that is certain, Roman Catholic theologians tell us, though not yet de fide.