The inchoate and the obsolescent, the indistinctness of immaturity, the incipient disintegration of decay, the deepening shadow of oblivion, the half-instinctive and organic bond of custom, whatever stirs the blood but excites only blurred images in the brain, and steals into character without passing through the gates of passion or of thought, finds imperfect or capricious reflection in his verse.
Browning's interest in "soul" was not, then, a diffused enjoyment of human nature as such.

But, on the other hand, human nature stood for too much with him, his sense of what all personality at the lowest implies was too keen, to allow him to relish, or make much use of, those unpsychological amalgams of humanity and thought,--the personified abstractions.

Whether in the base form branded by Wordsworth, or in the lofty and noble form of Keats's "Autumn" and Shelley's "West Wind," this powerful instrument of poetic expression was touched only in fugitive and casual strokes to music by Browning's hand.

Personality, to interest him, had to possess a possible status in the world of experience.

It had to be of the earth, and like its inhabitants.