II. His Ruling Symbols from The Philosophy of Shelley’s Poetry in Ideas of Good and Evil by William Butler Yeats.
“It may have been this memory, or it may have been some impulse of his nature too subtle for his mind to follow, that made Keats, with his love of embodied things, of precision of form and colouring, of emotions made sleepy by the flesh, see Intellectual Beauty in the Moon; and Blake, who lived in that energy he called eternal delight, see it in the Sun, where his personification of poetic genius labours at a furnace.” [via]