Some authors have undertaken comparative studies between Taoism and Christianity. This has been of interest for students of history of religion such as J. J. M. de Groot, among others. The comparison of the teachings of Lao Tzu and Jesus of Nazareth has been done by several authors such as Martin Aronson, and Toropov & Hansen (2002), who believe that they have parallels that should not be ignored. In the opinion of J. Isamu Yamamoto the main difference is that Christianity preaches a personal God while Taoism does not. Yet, a number of authors, including Lin Yutang, have argued that some moral and ethical tenets of these religions are similar. In neighboring Vietnam, Taoist values have been shown to adapt to social norms and formed emerging sociocultural beliefs together with Confucianism.