It is very difficult to reach. The narrow path is littered with loose stones and, in the spring when the thaw comes, it is a running stream, an angled gutter two hundred metres long, slicing across the sheer surface of the rock face, collecting meltwater as the scar incised in the bark of a rubber tree channels the sap.Some years, the local people claim, the water runs crimson with the sacred blood of the saint who lived in the cave as a hermit, dined on lichen or moss, consumed the pine nuts fallen from the firs overhanging the precipice high above, and drank only the stony water seeping through the roof of his abode.I have been there. It is not an outing for the fainthearted or sufferers from vertigo. In parts, the path is no wider than a scaffolder’s plank and one is obliged to move upwards crab fashion, one’s back to the rock, facing down into the valley below, across to a purple haze of mountains jagged like the scales of a dragon’s back. This, they say, is a test of one’s faith, a trial to be taken on the route to salvation.