From The Hammer of God by G. K. Chesterton.
“I think there is something rather dangerous about standing on these high places even to pray,” said Father Brown. “Heights were made to be looked at, not to be looked from.”
“Do you mean that one may fall over,” asked Wilfred.
“I mean that one’s soul may fall if one’s body doesn’t,” said the other priest.
“I scarcely understand you,” remarked Bohun indistinctly.
“Look at that blacksmith, for instance,” went on Father Brown calmly; “a good man, but not a Christian—hard, imperious, unforgiving. Well, his Scotch religion was made up by men who prayed on hills and high crags, and learnt to look down on the world more than to look up at heaven. Humility is the mother of giants. One sees great things from the valley; only small things from the peak.”