It does not in the least follow that we are to regard theism as merely or even mainly a tradition--as a doctrine received simply on authority, and transmitted from age to age, from generation to generation, without investigation, without reflection. It does not follow that it is not a truth the evidence of which has been seen in some measure by every generation which has accepted it, and into the depth and comprehensiveness and reasonableness of which humanity has obtained a constantly-growing insight. There have, it is true, been a considerable number of theologians who have traced all religious beliefs to revelation, and who have assigned to reason merely the function of passively accepting, retaining, and transmitting them. They have conceived of the first man as receiving the knowledge of God by sensible converse with Him, and of the knowledge thus received as transmitted, with the confirmation of successive manifestations, to the early ancestors of all nations. The various notions of God and a future state to be found in heathen countries are, according to them, broken and scattered rays of these revelations; and all the religious rites of prayer, purification, and sacrifice which prevail among savage peoples, are faint and feeble relics of a primitive worship due to divine institution. This view was natural enough in the early ages of the Christian Church and in medieval times, when the New World was undiscovered and a very small part of either Asia or Africa was known. It was consonant also to the general estimate of tradition as a means of transmitting truth, entertained by the Roman Catholic Church; but it is not consistent with the Protestant rejection of tradition, and it is wholly untenable in the light of modern science, the geography, ethnology, comparative mythology, &c., of the present day. A man who should thus account for the phenomena of the religious history of heathen humanity must be now as far behind the scientific knowledge of his age regarding the subject on which he theorises, as a man who should still ascribe, despite all geological proofs to the contrary, the occurrence of fossils in the Silurian beds to the action of the Noachian deluge.[5] [5] See Appendix IV.