Meditations by Marcus Aurelius is incredibly dense in wisdom and was written forever ago. Probably replaces 1000 help books easily.
Discussion
That may be the greatest book; I mean, most of the well known Greek philosophy books are on another level. My favorite is 'The Republic,' maybe because I was a political science student. 😅
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The tenants you can infer from it and so simple and impactful
Marcus Aurelius, Seneca, Epictetus, Sun Tzu, Confucius ... almost all modern self help books are using those classics in some way or another. Mixing them, emphasizing one aspect, etc. very few are bringing real new toughts.