But if you live your life without feeling and compassion for your fellowman—you are as an animal—’an eye for an eye, a tooth for a tooth’ & happiness & peace of mind is not attained by living thus

But if you live your life without feeling and compassion for your fellowman—you are as an animal—’an eye for an eye, a tooth for a tooth’ & happiness & peace of mind is not attained by living thus. (Truman Capote, In Cold Blood)