Medieval polemicists diverged sharply in how to argue with Muslims

Evidence

Despite the wide range of his knowledge and the vigour of his opinions, Ricoldo lacked the judgement of Fidenzio and the enthusiasm of Tripoli, the moderation of Marti and the singlemindedness of Lull. His arguments about the Trinity are of uneven quality and have diverse inspiration; he composed advice marked by good sense that he did not always follow. Muslims, he said, are peculiarly anxious to hear about the Incarnation and the Trinity, but, as these are above reason and intellect, they will not believe, and cannot understand, them; they laugh at them as contrary to the Qur’an, which they believe to be the Word of God. — Norman Daniel, Islam and the West, 1010