A couple of us wondered one time what Blake must have been thinking and came away shaken.
"He died ... in a most glorious manner. He said He was going to that Country he had all His life wished to see & expressed Himself Happy, hoping for Salvation through Jesus Christ – Just before he died His Countenance became fair. His eyes Brighten'd and he burst out Singing of the things he saw in Heaven."
He was clearly on some level out of touch with reality - but isn't that what Art is really about?
We sing his poem "The Lamb" to a setting by John Tavener. There is no question to me that he Got It.