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If nothing is self-evident, nothing can be proved. Similarly if nothing is obligatory for its own sake, nothing is obligatory at all.

C. S. Lewis (2003). “A Mind Awake: An Anthology of C. S. Lewis”, p.34, Houghton Mifflin Harcourt
If nothing is self-evident, nothing can be proved. Similarly if nothing is obligatory for its own sake, nothing is obligatory at all.