Anthony on Concluding Unscientific Postscript Robert L. Perkins International Commentary on Concluding Unscientific Postscript to Philosophical Fragments Google books Arthur F. Holmes Historical Roots of Existentialism: Kierkegaard Wheaton College Soren Kierkegaard by Absurd Being (YouTube) Metaphysics, Subjective-Objective Truth 1846 books Books by Søren Kierkegaard Epistemology literature Metaphysics books Philosophy of religion literature Works published under a pseudonym