“My proof for the truth of Christianity is, that I find its teachings contradictory and mutually destructive, for they are repugnant to reason and revolting to the intellect, on account of their inconsistency and mutual contrariety. No reflection can strengthen them, no discussion can prove them; and however thoughtfully we may investigate them, neither the intellect nor the senses can provide us with any argument in support of them. Notwithstanding this, I have seen that many nations and mighty kings of learning and sound judgment, have given in their allegiance to the Christian faith; so I conclude that if these have accepted it in spite of all the contradictions referred to, it is because the proofs they have received, in the form of signs and miracles, have compelled them to submit to it.” [163] On the other hand, it should be remembered that those who passed over from Christianity to Islam, under the influence of the rationalistic tendencies of the age, would find in the Muʻtazilite presentment of Muslim theology, very much that was common to the two faiths, so that as far as the articles of belief and the intellectual attitude towards many theological questions were concerned, the transition was not so violent as might be supposed. To say nothing of the numerous fundamental doctrines, that will at once suggest themselves to those even who have only a slight knowledge of the teachings of the Prophet, there were many other common points of view, that were the direct consequences of the close relationships between the Christian and Muhammadan theologians in Damascus under the Umayyad caliphs as also in later times; for it has been maintained that there is clear evidence of the influence of the Byzantine theologians on the development of the systematic treatment of Muhammadan dogmatics. The very form and arrangement of the oldest rule of faith in the Arabic language suggest a comparison with similar treatises of St. John of Damascus and other Christian fathers. [164] The oldest Arab Ṣūfīism, the trend of which was purely towards the ascetic life (as distinguished from the later pantheistic Ṣūfīism) originated largely under the influence of Christian thought. [165] Such influence is especially traceable in the doctrines of some of the Muʻtazilite sects, [166] who busied themselves with speculations on the attributes of the divine nature quite in the manner of the Byzantine theologians: the Qadariyyah or libertarians of Islam probably borrowed their doctrine of the freedom of the will directly from Christianity, while the Murjiʼah in their denial of the doctrine of eternal punishment were in thorough agreement with the teaching of the Eastern Church on this subject as against the generally received opinion of orthodox Muslims. [167] On the other hand, the influence of the more orthodox doctors of Islam in the conversion of unbelievers is attested by the tradition that twenty thousand