As a result, I have some questions (not necessarily directly for you, @patrickthebold, but for whoever cares to answer):
(1) Were you able to internalize the lessons from this book?
(2) Is there anything valuable in the back ~half of the book?
(3) If you read this book about 20 years ago, would you re-read it; or if read it less than 20 years ago, would you recommend your future self re-read it?
2. The revelation about quality
3. I've read it three or four times, generally about ten years apart. I'm due...
Edit: so to answer your points
1. No need to.
2. Worth reading the whole thing.
3. At the first reading when younger, one might focus too much on the philosophy and miss the story of the person behind the thoughts. It's not a book where you learn philosophy, but how this person thinks and how it impacts his life. With some life experience and perspective this aspect is much more interesting.
And the concept of "gumption".
But most especially that "quality" is the interface between the observer and the observed -- that what you like is a unique aspect of you and the thing (that you like), and that's okay. That concept has shaped my world.