Existentialism is essentially the continental version of American pragmatism.Tune in next week for "Relational theory remapped for Christian use", or Codd's left inner metaphor of sin.
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So Being and Time is basically a reworking of Kierkegaard using the concepts of a desacralized theology.
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authenticity = being in Christ
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The one real problem, however, -- in my opinion ---is that his "existentialism" like all the others, speaks in terms of operations of the ego, the left mind metaphor, or "outer I" whereas as I see it true spirituality (the operations of faith) comes out of the "inner I", or right mind metaphor.