“he had so heated himself with rapid walking in the fog and frost, this nephew of Scrooge‘s that he was all in a glow; his face was ruddy and handsome; his eyes sparkled, and his breath smoked again” about fred - motif of fire
"the cold within him froze his old features" about scrooge - motif of ice
“a solitary child, neglected by his friends, is left without knowledge or literature, to take pleasure in conjecturing upon the hard words dictated by the master.” about bob cratchit's childhood - motif of darkness