W. P. Ker,
Essays and studies: by members of the English Association…
“ There is a superficial likeness in Browning's theory to the 'Perfectibility' of some eighteenth-century philosophers; the difference is that Browning thinks of perfection as real, so that the imperfect human pilgrim is not a mere wanderer on from one stage to another, nor merely an instrument along with other finite things in building up the fabric of the Universe; he is thought of as one compelled by the Universe to put into his own small being all that the whole world means. ”
