How are tension and story's climax related?

In this excerpt from "dover beach" by matthew arnold, which two lines or sets of lines suggest that the speaker has undergone a loss of faith? the sea of faith was once, too, at the full, and round earth's shore lay like the folds of a bright girdle furled. but now i only hear its melancholy, long, withdrawing roar, retreating, to the breath of the night-wind, down the vast edges drear and naked shingles of the world. ah, love, let us be true to one another! for the world, which seems to lie before us like a land of dreams, so various, so beautiful, so new, hath really neither joy, nor love, nor light, nor certitude, nor peace, nor for pain; and we are here as on a darkling plain swept with confused alarms of struggle and flight, where ignorant armies clash by night.

How can you tell that the text is from a biography

Explain the effect of the rhetorical questins for the below paragraph."i pinched myself: was i still alive? was i awake? how was it possible that men, women, and children were beiing burned and that the world kept silent? no. all this could not be real. a nightmare soon i would wake up with a start, my heart pounding, and find that i waas back in the room of my childhood, with my "