| | This is a little like asking which is the most important part of proper nutrition-- carbohydrates, fat, protein, vitamins, or minerals?
But if I must decide, my money is on logic: the principle of identity, the principle of contradiction, the principle of the excluded middle. You might note that this entails both epistemology and metaphysics, which is right...the two combined are the foundation of rational living. A vote for one is a vote for the other.
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