Cormac Mccarthy said this quote

They caught up their horses and turned back. Nothing moved in that high wilderness save the wind. They did not speak. They were men of another time for all that they bore christian names and they had lived all their lives in a wilderness as had their fathers before them. They'd learnt war by warring, the generations driven from the eastern shore across a continent, from the ashes at Gnadenhutten onto the prairies and across the outlet to the bloodlands of the west. If much in the world were mystery the limits of that world were not, for it was without measure or bound and there were contained within it creatures more horrible yet and men of other colors and beings which no man has looked upon and yet not alien none of it more than were their own hearts alien in them, whatever wilderness contained there and whatever beasts.