"To a thorough-going naturalism, naturalism itself is logically impossible." Hence the impossibility of the naturalistic theory as an explanation of life.
Then it fails to provide a high ideal for life, and to release man from sordid motives.

It gives no place for love, for work for its own sake, for altruistic conduct, or for devotion to the high ideals of life.

The aim of life is limited to this world--man has but to aim at the enjoyment and preservation of his own life.

The mechanical explanation of life, too, does away with the possibility of human freedom and personality, and it is futile to urge man to greater efforts when success is impossible.

It is a theory which does justice merely to a life of pleasure and pain, its psychology has no soul, and its political economy bases the community upon selfishness.
In this way Eucken disproves the claim of naturalism; in doing so he points out that a satisfactory solution must take account of the life of nature in a way which religion and idealism have failed to do.
Of late years _Socialism_ and _Individualism_ have come into prominence as theories of life.