3. St. Paul finds the root of sin in the refusal {82} of man in general to recognize God. He asserts that they might have known Him, or rather did know Him, but declined to act on that knowledge. Now it is noticeable that he does not ascribe this knowledge of God, which he declares to have been possible to man everywhere, to an original revelation, nor even in this place to the moral conscience, but to the evidence of nature. In this, as in his ridicule of idolatry, he is in accordance, not only with Jewish thought, but with contemporary Greek philosophy. The argument from design had become habitual in the schools, having been stated first of all with transparent simplicity by Xenophon in his account of the reasoning of Socrates. St. Paul then finds in this instinctive inference from nature up to nature's God, 'a testimony of the soul naturally Christian.' He is able, at Lystra and Athens, to assume that men will respond to it. It is another question, into which St. Paul does not specifically enter, how far back in human history the appreciation of this reasoning goes. But it is worth noticing that among our contemporary investigators of the history of religion, some at least of the most acute have been coming back to what we may call a modified {83} form of the doctrine of an original monotheism[17]. They think that even savage religions generally bear traces, that are plainly independent, of a belief in one great and mostly good God; and that there is no evidence that this higher belief was developed out of the lower belief in manifold spirits of more ambiguous characters. They see no reason to suppose that the higher belief has been gradually arrived at within any period into which the human mind can penetrate with its investigations or its well-grounded conjectures. Humanity appears to them to have been haunted from its origins with this belief in the one God; and they regard all the higher religious movements as attempts not so much to arrive at, as to retain hold on, a belief which is continually in danger of being overlaid and forgotten. It does not appear that anthropological science is at all likely to disprove such a view which on the other hand has a great deal of evidence to justify it. At least, the {84} evidences of deterioration in the history of religion are manifold and conspicuous. The lowest view of God and man is not by any means always the oldest. And the recognition of such facts is quite consonant with the doctrine of the evolution of religion in its more reasonable forms. Meanwhile, every one is in sufficient harmony with St. Paul's argument who recognizes the universal facts of sin and guilt and needless moral deterioration among men; and who recognizes also that the secret of sin is the wilful refusal on men's part to know God as they might have known Him, and obey Him as they might have obeyed Him.