Critique of Pure Reason
Immanuel Kant
16 people recommended it in 11 threads, 2010–2025.
1 commenter pushed back on it — worth reading the threads.
What people on Hacker News said
You'll hear him referenced a lot if you continue to read philosophy so you should familiarize yourself with his thinking, especially on his thoughts in epistemology.
"But it is the usual fate of human reason in Speculation, to make its edifice ready as soon as possible, and then for the first time investigate, whether the foundation has been even well laid. Then all kinds of excuses are sought after in order to console us for its want of fitness, or rather indeed to avoid so late and dangerous an examination."
Again, the Critique of Pure Reason is (from my understanding in studying if for a year a very long time ago) a unification of empiricism and rationalism, and a rejection of idealism in a period when that was an active fight.
If you can find someone with little to no philosophical background who can pick up A Critique of Pure Reason or the Tractatus and actually get anything out of it then you've probably found Kant or Wittgenstein reborn.
Critique of Pure Reason put radical philosophical skepticism (and hence empiricism) in perspective. I find the model of the human mind useful in some situations.
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