One special form of the harm done by the extreme sects in the seventeenth century was this: that they really died young, and that what has infected our culture since has not been their life, or even their death, but rather their decay. In most cases the Puritans lost their religion and retained their morality; a deplorable state of things for anybody. If the special narrow theologies had not perished rapidly as they did, the atmospheric moral mood would not have lingered on exactly in the way it did. But, above all, it permitted of a process which seems to me one of the strangest and most interesting in human history; but which does not seem as yet to have been noticed by historians. It is rather like the geological process of the formation of a fossil. Every one knows that a fossil fish is not a fish; nor a fossil bird a bird. I do not mean merely in the obvious sense: that we should be surprised, nay annoyed, in a restaurant, if we asked for a fish and they gave us a stone. I mean that a fossil is a form, in which remains no actual fragment of a fish. It is a hollow mould or image of a fish, which is very gradually filled up by the infiltration of something else, after the actual fish has decayed. Thus we find the general outline of these stony and very literal faiths filled up by something else when the old fanaticism has decayed....
The point is perhaps clearest in the case of Prohibition. The old original Puritans were not Prohibitionists. Oliver Cromwell was a brewer; but he was not inspired or intoxicated by beer, nor (like the teetotallers) inspired and intoxicated by the absence of beer. Whatever his faults, he did most certainly have a real religion, in the sense of a creed. But it was a sombre creed, one which had been made intentionally more stern and ruthless than the other creeds; and this created a new mood and moral atmosphere, which ultimately spread all over the great plains of Puritan America. Now the point is this: that as the creed crumbled slowly as a creed, its place was taken by something vaguer but of the same general spirit. The severe theological credo was replaced by a severe social veto. You can put it another way if you like, and say that America tolerated Prohibition, not because America was Puritan, but because America had been Puritan. The idea of morality that came to prevail till lately at least, was in every sense a survival of Puritanism, even if it was also in a sense a substitute for Puritanism. That is the essential history of that curious episode; the teetotal ethic of modern times. Prohibition was not a part of the origin of Puritanism; none the less, Prohibition was a thing of Puritan origin.
-Avowals and Denials (1934)