There is such a simplicity in this speech that boils existentialism down to its essentially humane expectancies of its "practitioners."
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I was really into existentialism around my sophomore and junior years of high school, mostly because I feel like the emphasis on individual choice and responsibility, good and bad, was what I needed at the time. I realized in finally reading this in detail that the openness of existentialism—where the future is fundamentally blank and neutral, up to us—helped set me up for where I currently am with leftism/socialism and radical optimism and personal choice with political weight. Which is cool and I still have a soft spot for this, even if it's not the most infallible or wonderful intellectual development ever. 
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did he even read heidegger's letter on humanism
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I definitely want to read another work by Sartre

Gran tratado filosófico. Si queren empezar a leer a Sartre empiecen por acá. Definitivamente quiero seguir leyendo sus obras.
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Maybe because I am a very young person minoring in philosophy very prematurely but I absolutely have no idea what Naville is talking about