In the stream of evolution man appears as a result of natural causes. The poet by the analogy of the stream and its antecedent causes, already explained, does admit of natural causes, heredity or environment so far as the development of physical form of man and the development of five sense perceptions in him are concerned. This casual factor does not extend to his moral or inner existence. There is no physical necessity in this inner existence and no natural causation which links up the parts. Good or evil relates to the moral nature of man.
Morality is in no physical sense an outer object.
It is not derived from sense experience or accounted for by physical causes. It relates to the inner life of man which should shape his actions in this world. Here man has, according to the poet, an absolute free will not fettered by any outside agent and an inescapable responsibility. They grow in their scope and power with the development of moral existence. This theory of unbounded freedom of man and the responsibility from which he cannot escape almost borders on the concept of freedom and responsibility of modern existentialism, except of course its crisis.