William Blake and his Illustrations to The Divine Comedy in Ideas of Good and Evil by William Butler Yeats.
“There are many mediums in the means—none, oh, not a jot, not a shadow of a jot, in the end of great art. In a picture whose merit is to be excessively brilliant, it can’t be too brilliant, but individual tints may be too brilliant…. We must not begin with medium, but think always on excess and only use medium to make excess more abundantly excessive.” [via]