And thus, in full, there are four classes: the men who feel nothing, and therefore see truly; the men who feel strongly, think weakly, and see untruly (second order of poets); the men who feel strongly, think strongly, and see truly (first order of poets); and the men who, strong as human creatures can be, are yet submitted to influences stronger than they, and see in a sort untruly, because what they see is inconceivably above them. This last is the usual condition of prophetic inspiration.
Volume III, part IV, chapter XII (1856). - Modern Painters (1843-1860)