Question everything... that's a key insight from the great Greek philosopher Socrates. We may think we know ourselves and what makes us happy... but that's not always true.

Yale professor Tamar Gendler says that by harnessing our "inner Socrates" we can ask ourselves why we think or feel certain things. We might then find that deeply-held convictions that money or status or accolades are a reliable route to happiness aren't correct, and can then start to pursue the things that might really make us happier.

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