So unproductive has conservatism been in producing a general conception of how a social order is maintained that its modern votaries, in trying to construct a theoretical foundation, invariably find themselves appealing almost exclusively to authors who regarded themselves as liberal. Macaulay, Tocqueville, Lord Acton, and Lecky certainly considered themselves liberals, and with justice; and even Edmund Burke remained an Old Whig to the end and would have shuddered at the thought of being regarded as a Tory.
Also from the same essay:
to the liberal neither moral nor religious ideals are proper objects of coercion, while both conservatives and socialists recognize no such limits.
Personally, I find that the most objectionable feature of the conservative attitude is its propensity to reject well-substantiated new knowledge because it dislikes some of the consequences which seem to follow from it "“ or, to put it bluntly, its obscurantism. I will not deny that scientists as much as others are given to fads and fashions and that we have much reason to be cautious in accepting the conclusions that they draw from their latest theories. But the reasons for our reluctance must themselves be rational and must be kept separate from our regret that the new theories upset our cherished beliefs. I can have little patience with those who oppose, for instance, the theory of evolution or what are called "mechanistic" explanations of the phenomena of life because of certain moral consequences which at first seem to follow from these theories, and still less with those who regard it as irrelevant or impious to ask certain questions at all. By refusing to face the facts, the conservative only weakens his own position. Frequently the conclusions which rationalist presumption draws from new scientific insights do not at all follow from them. But only by actively taking part in the elaboration of the consequences of new discoveries do we learn whether or not they fit into our world picture and, if so, how. Should our moral beliefs really prove to be dependent on factual assumptions shown to be incorrect, it would hardly be moral to defend them by refusing to acknowledge facts.