Descartes has interesting theories on this. He says that all humans have a natural capability of "reason" - causing them to know what is the truth and what is not. He says that we develop varying definitions of the truth because each individual mind takes into account different factors into every decision, and therefore no decision can be the same, even though there is a "truth" out there - but no human mind is capable of finding it.
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"Nature herself makes the wise man rich."
-Cicero
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