The same course of reasoning is pursued in regard to the idea of duty, and the knowledge of right and wrong. "A direct communication of the Divine Will was made to the primogenitors of our race," and to this source _alone_ we are indebted for all correct ideas of right and wrong. "Whatever is found pure in morals, in ancient or modern writers, may be traced to _indirect_ revelation."[84] Verbal instruction--tradition or scripture--thus becomes the source of all our moral ideas. The doctrine of immortality, and of a future retribution,[85] the practice of sacrifice--precatory and expiatory, are also ascribed to the same source.[86] Thus the only medium by which religious truth can possibly become known to the masses of mankind is _tradition_. The ultimate foundation on which the religious faith and the religious practices of universal humanity have rested, with the exception of the Jews, and the favored few to whom the Gospel has come, is uncertain, precarious, and easily corrupted tradition. [Footnote 84: Watson, "Theol. Inst.," vol. ii. p. 470.] [Footnote 85: Id. ib., vol. i. p. 11.] [Footnote 86: Id. ib., vol. i. p. 26.] The improbability, inadequacy, and incompleteness of this theory will be obvious from the following considerations: 1. It is highly improbable that truths so important and vital to man, so essential to the well-being of the human race, so necessary to the perfect development of humanity as are the ideas of God, duty, and immortality, should rest on so precarious and uncertain a basis as tradition is admitted, even by Mr. Watson, to be.