Oh! But he was a tight-fisted hand at the grindstone, Scrooge! a squeezing, wrenching, grasping, scraping, clutching, covetous old sinner! Hard and sharp as flint, from which no steel had ever struck out generous fire; secret, and self-contained, and solitary as an oyster. The cold within him froze his old features, nipped his pointed nose, shrivelled his cheek, stiffened his gait;5 made his eyes red, his thin lips blue; and spoke out shrewdly in his grating voice. A frosty rime6 was on his head, and on his eyebrows, and his wiry chin. He carried his own low temperature always about with him; he iced his office in the dog-days; and didn’t thaw it one degree at Christmas. What is the author's likely purpose for the figurative language used in paragraph 6? Cite at least two pieces of evidence from the paragraph in your response.