Conservatives believe in what may be called the principle of prescription
"Conservatives sense that modern people are dwarfs on the shoulders of giants, able to see farther than their ancestors only because of the great stature of those who have preceded us in time. Therefore conservatives very often emphasize the importance of prescription—that is, of things established by immemorial usage, so that the mind of man runneth not to the contrary. There exist rights of which the chief sanction is their antiquity—including rights to property, often. Similarly, our morals are prescriptive in great part. Conservatives argue that we are unlikely, we moderns, to make any brave new discoveries in morals or politics or taste. It is perilous to weigh every passing issue on the basis of private judgment and private rationality. The individual is foolish, but the species is wise, Burke declared. In politics we do well to abide by precedent and precept and even prejudice, for the great mysterious incorporation of the human race has acquired a prescriptive wisdom far greater than any man’s petty private rationality."
Taken from the Russel Kirk Center