The creeds we chant are the sweat of Grecian brows, promulgated by their Councils, and established by the martyrdom of many.
Yet their natural slowness, as it happens, turns to the glory of the Latins, since as they were less learned in their studies, so they were less perverse in their errors.

In truth, the Arian heresy had all but eclipsed the whole Church; the Nestorian wickedness presumed to rave with blasphemous rage against the Virgin, for it would have robbed the Queen of Heaven, not in open fight but in disputation, of her name and character as Mother of God, unless the invincible champion Cyril, ready to do single battle, with the help of the Council of Ephesus, had in vehemence of spirit utterly extinguished it.

Innumerable are the forms as well as the authors of Greek heresies; for as they were the original cultivators of our holy faith, so too they were the first sowers of tares, as is shown by veracious history.

And thus they went on from bad to worse, because in endeavouring to part the seamless vesture of the Lord, they totally destroyed primitive simplicity of doctrine, and blinded by the darkness of novelty would fall into the bottomless pit, unless He provide for them in His inscrutable prerogative, whose wisdom is past reckoning.
Let this suffice; for here we reach the limit of our power of judgment.
One thing, however, we conclude from the premises, that the ignorance of the Greek tongue is now a great hindrance to the study of the Latin writers, since without it the doctrines of the ancient authors, whether Christian or Gentile, cannot be understood.

And we must come to a like judgment as to Arabic in numerous astronomical treatises, and as to Hebrew as regards the text of the Holy Bible, which deficiencies, indeed, Clement V.