Sir Thomas Walker Arnold,
The Preaching of Islam: A History of the Propagation of the Muslim Faith
“ Jacobites as a separate sect, the tenets that they had so long and at so great a cost struggled to maintain, were embodied in doctrines of the most abstruse and metaphysical character, and many doubtless turned in utter perplexity and weariness from the interminable controversies that raged around them, to a faith that was summed up in the simple, intelligible truth of the Unity of God and the mission of His Prophet, Muḥammad. ”
