There are certain books I like to read again because they speak to me personally. Don Miguel Ruiz's The Four Agreements is one of those books.
Be impeccable with your word
Don't take anything personally
Don't make assumptions
Always do your best
These concepts are simple enough, but they can be difficult to follow. Under each heading, Ruiz presents ideas in small bites that will help a person put these goals into practice.
Our actions are determined by our thoughts and ideas. We can change these by carefully considering how we think and feel and changing the internal dialogue. Saying "I'm so stupid" only makes us feel bad, while saying "I'll be careful next time" is useful. It's easy to think that what that person said or did to us was malicious, but many times they are just reflecting their own inner torments to the rest of us. Even if we can't keep these ideals every day, we can always do our best.
This short book may transform the lives of those who are willing to give it an honest try.
The Seat of the Soul by Gary Zukav
The Four Loves by C.S. Lewis
The Five Love Languages by Gary Chapman