Not that strong natures, as such, have much part in Browning's poetic-world; the strength that allured his imagination was not the strength that is rooted in nerve or brain, slowly enlarging with the build of the organism, but the strength that has suddenly to be begotten or infused, that leaps by the magic of spiritual influence from heart to heart.

If Browning multiplies and deepens the demarcations among material things, he gives his souls a rare faculty of transcending them.
Bright spiritual beings like Pippa shed their souls innocently and unwittingly about like a spilth of "X-rays," and the irradiation penetrates instantly the dense opposing integuments of passion, cupidity, and worldliness.

At all times in his life these accesses of spiritual power occupied his imagination.

Cristina's momentary glance and the Lady of Tripoli's dreamed-of face lift their devotees to completeness:-- "She has lost me, I have gained her, Her soul's mine, and now grown perfect I shall pass my life's remainder." Forty years later, Browning told with far greater realistic power and a grim humour suited to the theme, the "transmutation" of Ned Bratts.
Karshish has his sudden revealing flash as he ponders the letter of Abib:-- "The very God! Think, Abib, dost thou think,-- So the All-great were the All-loving too"-- and the boy David his prophetic vision.

A yet more splendid vision breaks from the seemingly ruined brain of the dying Paracelsus, and he has a gentler comrade in the dying courtier, who starts up from his darkened chamber crying that-- "Spite of thick air and closed doors God told him it was June,--when harebells grow, And all that kings could ever give or take Would not be precious as those blooms to me." But it is not only in these magical transitions and transformations that Browning's joy in soul was decisively coloured by his joy in power.