It is scarcely possible to doubt that the love of man has become instinctive in the dog.
Charles DarwinIt is not the conscience which raises a blush, for a man may sincerely regret some slight fault committed in solitude, or he may suffer the deepest remorse for an undetected crime, but he will not blush... It is not the sense of guilt, but the thought that others think or know us to be guilty which crimsons the face.
Charles DarwinThere is no fundamental difference between humans and the higher mammalsin their mental faculties
Charles Darwin