In Emersonian fashion, Ernst Cassirer argued that "We cannot define man by any inherent principle which constitutes his metaphysical essence--nor can we define him by any inborn faculty or instinct that may be ascertained by empirical observation. Man's outstanding characteristic, his distinguishing mark, is not his metaphysical or physical nature--but his work. It is this work, it is the system of human activities, which defines and determines the circle of 'humanity.' Language, myth, religion, art, science, history are the constituents, the various sectors of this circle. A 'philosophy of man' would therefore be a philosophy which would give us insight into the fundamental structure of each of these human activities, and which at the same time would enable us to understand them as an organic whole" (Cassirer,
An Essay On Man, p. 68).