Medieval Christian writers produced no thorough survey of Islamic morals, only fragments

Evidence

Serious estimates over the whole field of morals were rare; no thorough one existed. Neither polemic treatment nor satiric reproof of Christians suits an academic and dispassionate examination. There were only fragments. Mark put into the Prophet’s mouth a summary of the moral teaching of the Qur’an which has no tendentious purpose: ‘Be humble, patient, chaste, except with your wives; avoid adultery, murder, theft …’ This largely corresponds with the reality of Qur’anic doctrine, and reveals both resemblance and divergence between Christian and Islamic morals, and does so excellently, so far as it goes, which is not very far. — Norman Daniel, Islam and the West, 1125

Categorization

• XREF: connects to: Medieval writers ignored Islamic ritual because praising it served no polemic purpose