The recess of the English Parliament [in 1641]  lasted six weeks. The day on which the Houses met again is one of the most remarkable epochs in our history. From that day dates the corporate existence of the two great parties which have ever since alternately governed the country. In one sense, indeed, the distinction which then became obvious had always existed, and always must exist. For it has its origin in diversities of temper, of understanding, and of interest, which are found in all societies, and which will be found till the human mind ceases to be drawn in opposite directions by the charm of habit and by the charm of novelty. Not only in politics but in literature, in art, in science, in surgery and mechanics, in navigation and agriculture, nay, even in mathematics, we find this distinction. Everywhere there is a class of men who cling with fondness to whatever is ancient, and who, even when convinced by overpowering reasons that innovation would be beneficial, consent to it with many misgivings and forebodings. We find also everywhere another class of men, sanguine in hope, bold in speculation, always pressing forward, quick to discern the imperfections of whatever exists, disposed to think lightly of the risks and inconveniences which attend improvements and disposed to give every change credit for being an improvement. In the sentiments of both classes there is something to approve. But of both the best specimens will be found not far from the common frontier. The extreme section of one class consists of bigoted dotards: the extreme section of the other consists of shallow and reckless empirics.

— Macaulay, The History of England from the Accession of James II