Never really been one to enjoy popular books on philosophy (Alchemist was overrated, Monk who sold his Ferrari cliched, The Secret just boring ...IMO) and picked this up at a used book store. The book truly put a new perspective on life for me.
Perhaps it was a combination of the time when I read the book: Undue stress, massive imposter syndrome, that feeling of not moving ahead in life, and the oh-so-messed-up quarter life crisis, but this book was an absolute eyeopener for me.
Find your own meaning in life, and live your own philosophy instead of aping a "master" (spiritual or otherwise) because a "master" is someone who has shaped his own philosophy and that will almost NEVER completely apply to you. In the book, when the titular Siddhartha realises this and starts off on his own journey, something clicked within me and I started making genuine attempts to get past my (mostly) self-imposed problems in life. Can easily say this book helped me get through confusing times and come out better on the other side
Truly a life-changing book for me, and no wonder it's been popular for over half a century!
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The Art of War, The War of Art (except the final bits of the book) and Zen and the Art of Motorcycle Maintenance come in a close second, each having shaped the way I look at decision making processes and influenced my general life strategy