"I believe the ultimate goal of living and refining your values is to identify and achieve congruence with universal principles."

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The concept of congruence in Euclidean geometry is not exactly the same as that in non-Euclidean geometry. ..."Congruent" means in Euclidean geometry the same as "determining parallelism," a meaning which it does not have in non-Euclidean geometry.

— Hans Reichenbach