This book is full of excellent advice, but it's always hard to remember and apply the information in these self-help books.
DeSalvo emphasises the importance of self-observation, understanding your motivations and not hanging on to your past mistakes. This is a good way to shift the focus from ego-centred living. I know that this has been written many times, but it helps to do this if you think of your life as a story or a movie.
He also writes about the ten elements of healthy relationships, including trust, communication and compromise. DeSalvo suggests ways to show respect to others and be honest. He also includes useful sections on difficult relationships.
This is well-worth reading if you want to improve your understanding of other people.