"Buddhism is now split into two distinct Churches: the Southern and the Northern Church. The former is said to be the purer form, as having preserved more religiously the original teachings of the Lord Buddha. It is the religion of Ceylon, Siam, Burmah and other places, while Northern Buddhism is confined to Tibet, China and Nepaul. Such a distinction, however, is incorrect. If the Southern Church is nearer, in that it has not departed, except perhaps in some trifling dogmas due to the many councils held after the death of the Master, from the public or exoteric teachings of Sâkyamuni—the Northern Church is the outcome of Siddhârta Buddha’s esoteric teachings which he confined to his elect Bhikshus and Arhats. In fact, Buddhism in the present age, cannot be justly judged either by one or the other of its exoteric popular forms. Real Buddhism can be appreciated only by blending the philosophy of the Southern Church and the metaphysics of the Northern Schools....Correspondentially they stand in their relation to each other as Protestantism to Roman Catholicism. Both err by an excess of zeal and erroneous interpretations, though neither the Southern nor the Northern Buddhist clergy have ever departed from truth consciously, still less have they acted under the dictates of priestocracy, ambition, or with an eye to personal gain and power, as the two Christian Churches have."
January 1, 1970
https://en.wikiquote.org/wiki/Buddhism