Existential

“Money is precisely an object whose status depends on how we 'think' about it: if people no longer treat this piece of metal as money, if they no longer 'believe' in it as money, it no longer is money.”
― Slavoj Žižek, The Sublime Object of Ideology

“When a person can't find a deep sense of meaning, they distract themselves with pleasure.”
― Viktor E. Frankl

“If you only read the books that everyone else is reading, you can only think what everyone else is thinking. That’s the world of hicks and slobs. Real people would be ashamed of themselves doing that.”
― Haruki Murakami, Norwegian Wood

“To know thyself is the beginning of wisdom.”
― Socrates