II. His Ruling Symbols from The Philosophy of Shelley’s Poetry in Ideas of Good and Evil by William Butler Yeats.

“Shelley compares the flowing through our mind of ‘the universe of things,’ which are, he has explained elsewhere, but thoughts, to the flowing of the Arne through the ravine, and compares the unknown sources of our thoughts in some ‘remoter world’ whose ‘gleams’ ‘visit the soul in sleep,’ to Arne’s sources among the glaciers on the mountain heights.” [via]