Mc)read this sentence from abraham lincoln’s letter to a citizen of kentucky: by general law, life and limb must be protected; yet often a limb must be amputated to save a life, but a life is never wisely given to save a limb. which rhetorical device does lincoln use in this sentence, and for what purpose? metaphor; shows that the whole is greater than the sum of its parts metaphor; shows that all parts of the whole must be protected simile; shows that the whole is greater than the sum of its parts simile; shows that all parts of the whole must be protected