When we have seen that the elucidation of the reality of the real is based upong seeing Dasein itself in its basic constitution, then we also have the basic requirement for all attempts to decide between realism and idealism. In elucidating these positions it is not so much a matter of clearing them up or of finding one or the other to be the solution, but of seeing that both can exist only on the basis of a neglect: they presuppose a concept of 'subject' and 'object' without clarifying these basic concepts with respect to the basic composition of Dasein itself. But every serious idealism is in the right to the extent that it sees that being, reality, actuality can be clarified only when being, the real, is present and encountered. Whereas every realism is right to the extent that it attempts to retain Dasein's natural consciousness of the extantness of the world. But it immediately falls short in attempting to explain this reality by means of the real itself, in believing that it can clarify reality by means of a causal process. Regarded strictly in terms of the scientific method, therefore, realism is always at a lower level than every idealism, even when that idealism goes to the extreme of solipsism.

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