The single most important stimulus to my thought came by chance when I took a course from Robert Redfield entitled "Folk Society." …His approach was … - William Hardy McNeill

The Chinese language lacked terms capable of conveying Buddhist meanings; and not until the fifth century did a handful of scholars become sufficiently at home in both Chinese and Indian learning to be able to translate Buddhist texts into Chinese with a modicum of adequacy. ...the novel and initially alien outlook of the Indian faith had somehow to come to terms with the various strands already woven into Chinese culture, ranging... from Confucian and Taoist learning to local sub-literate peasant magic. ...while accommodating themselves to older Chinese expectations, Buddhist doctrines and practices simultaneously widened and redefined traditional Chinese sensibilities and aspirations.

The diffusion of alchemy westward, like the movement of astrology eastward, became significant only in the centuries after 200 A.D. The conservatism of learning was such that, even when commercial intercourse had made intellectual contacts possible, little serious interchange took place until severe social stress had disturbed the even tenor of the times in China, India, and Europe. Technology was a little, but only a little, less conservative.

The rise of Islam offers perhaps the most impressive example in world history of the power of words to alter human behavior in sudden, surprising ways.