Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent book for mastering one's own mind

This is my favorite book for lessons on mastering one's own mind. It gave me the tools to finally "quiet" the noise in my mind and focus on what's really important - the only thing that is important - which is this present moment, the Now. I have never found a book that explains how to take control of your own mind in the way this book does, it is brilliant!