The inhabitants of mountains form distinct races, and are careful to preserve their genealogies. Men in a small district necessarily mingle blood by intermarriages, and combine at last into one family, with a common interest in the honour and disgrace of every individual. Then begins that union of affections, and co-operation of endeavours, that constitute a clan. They who consider themselves as ennobled by their family, will think highly of their progenitors, and they who through successive generations live always together in the same place, will preserve local stories and hereditary prejudices. Thus every Highlander can talk of his ancestors, and recount the outrages which they suffered from the wicked inhabitants of the next valley.
– Samuel Johnson, A Journey to the Western Islands of Scotland (1775).