On the Sources of Rivers by Hilaire Belloc

There are certain customs in man the permanence of which gives infinite pleasure. When the mood of the schools is against them these customs lie in wait beneath the floors of society, but they never die, and when a decay in pedantry or in despotism or in any other evil and inhuman influence permits them to reappear they reappear.

One of these customs is the religious attachment of man to isolated high places, peaks, and single striking hills. On these he must build shrines, and though he is a little furtive about it nowadays, yet the instinct is there, strong as ever. I have not often come to the top of a high hill with another man but I have seen him put a few stones together when he got there, or, if he had not the moral courage so to satisfy his soul, he would never fail on such an occasion to say something ritual and quasi-religious, even if it were only about the view; and another instinct of the same sort is the worship of the sources of rivers.