Rereading "Living the Martial Way" by Forrest Morgan. It deals with concepts of the martial arts like Mushin, Zanshin, etc and how to integrate the principals of martial arts into your life outside the dojo. Also "In the Dojo" by Dave Lowry about the different aspects and history of Japanese martial arts like etiquette, uniforms, and details about the arrangement of Kamiza, and the dojo itself.
Jikishin kore dojo nari