What's the most life-changing book you've ever read?

It is mostly forgotten wisdom, but you will be surprised by how contemporary it is. A serious dissertation was published in a form of a humoristic novel in 1959. Enjoy. https://www.amazon.com/Parkinson...

Civilization and its discontents by Freud. A very good analysis on man's motives, how society works and dysfunctions and the "algorithm" inside our minds.

The book that profoundly changed my life is My Life in Middlemarch by George Eliot. It's beautiful writing and a fantastic story.