I was reading George Eliot's 1872 novel Middlemarch when I came across a passage that struck me, in the most immediate sense, but I couldn't quite wrap my head around. I read over it a few times but I thought writing it down would prove more fruitful.

A breif bit of context; Dorothea, on her honeymoon in Rome, is reflecting on and having doubts about the marriage of which, in the first part of the novel, she has tirelessly willed into existence.

This extract comes from the beginning of Chapter 20 and p161 of the 1994 Wordsworth Classsics Edition.

To those who have looked at Rome with the quickening power of a knowledge which breathes a growing soul into all historic shapes, and traces out the supressed transitions which unite all contrasts, Rome may still be the spiritual centre and interpreter of the world. But let them conceive one more historical contrast: the gigantic broken revelations of that Imperial and Papal city thrust abruptly on the notions of a girl who had been brought up in English Swiss Puritanism, fed on meagre Protestant histories and on art chiefly of the hand-screen sort of a girl whose ardent nature turned all her small allowance of knowledge into principles, fusing her actions into their mould, and whose quick emotions gave the most abstract things the quality of a pleasure or a pain; a girl who had lately become a wife, and in tumultuos preoccupation with her personal lot. The weight of unintelligible Rome might lie easily on bright nymphs to whom it formed a background for the brilliant picnic of Anglo-foreign society; but Dorothea had no such defence against deep impression. Ruins and basilacs, palaces and colossi, set in the midst of a sordid present, where all that was living and warm-blooded seemed sunk in the deep degeneracy of a superstition divorced from reverence; the dimmer but yet eager Titanic life gazing and struggling on walls and ceilings; the long vistas of white forms whos emarble eyes seemed to hold monotonous light of an alien world: all this vast wreck of ambitious ideals, sensuous and spiritual, mixed confusedly with the signs of breathing forgetfulness and degredation, at first jarred her as with an electric shock, and then urged themselves on her with tha ache belonging to a glut of confused ideas which check the flow of emotion. Forms both pale and glowing took possession of her young sense, and fixed themselves in her memory even when she was not thinking of them, preparing strange associations which remained through he after-years. Our moods are apt to bring with them images which succeed each other like the magic-lantern pictures of a doze; and in certain states of dull forlornness Dorothea all her life continued to see the vastness of St Peter's, the huge bronze canopy, the excited intention in the attitudes and garments of the prophets and evangelists in the mosaics above, and the red drapery which was being hung for Christmas spreading itself everywhere like a disease of the retina.