What is the underlying theme of this passage?

then an old wolf, gaunt and battle-scarred, came forward. buck writhed his lips into the preliminary of a snarl, but sniffed noses with him, whereupon the old wolf sat down, pointed nose at the moon, and broke out the long wolf howl. the others sat down and howled. and now the call came to buck in unmistakable accents. he, too, sat down and howled. this over, he came out of his angle and the pack crowded around him, sniffing in half-friendly, half-savage manner. the leaders lifted the yelp of the pack and sprang away into the woods. the wolves swung in behind, yelping in chorus. and buck ran with them, side by side with the wild brother, yelping as he ran.
(from the call of the wild by jack london)
isolation from brethren
honor of battle
beauty of nature
deep instincts
nextreset

"spring, the sweet " from summer's last will and testament spring, the sweet spring, is the year's pleasant king, then blooms each thing, then maids dance in a ring, cold doth not sting, the pretty birds do sing: cuckoo, jug-jug 1 , pu-we, to-witta-woo! the palm2 and may3 make country houses gay, lambs frisk and play, the shepherds pipe4 all day and we hear aye5 birds tune this merry lay6: cuckoo, jug-jug, pu-we, to-witta-woo! the fields breathe sweet, the daisies kiss our feet, young lovers meet, old wives a-sunning sit, in every street these tunes our ears do greet: cuckoo, jugjug, pu-we, to-witta-woo! spring, the sweet spring! –thomas nashe jug-jug: sound of the nightingale palm: willow may: hawthorn pipe: play a shepherd's flute aye: always lay: song choose the sense that the poet appeals to in the last two lines of each stanza.

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 does gregor feel about his fathers transformation?