Hagakure: Book of the Samurai, I must have read this book at least 10 times. A great guide to living mindfully, with purpose, and focus. Also, it's a very succinct explanation of how to live a moral life.
The effect and relevance of trust is there in our lives and relationships and in our business. Just because you can't see it doesn't mean it's not there. Sometimes it takes putting on a pair of "trust glasses" to see it. Understanding the value of trust will help you grow your business. S. Covey