Author and speaker, Matthew Kelly, coined the motto "Become-the-Best-Version-of-Yourself" in four aspects: physically, emotionallly, intellectually and spiritually. This structure is very useful for self-development. The books recommended below suggest some basic thoughts on what might apply to these areas of self-development. Only you can determine the specific content for areas according to your own needs for self-improvement.
Kelly says, "Physically, emotionally, intellectually, spiritually, we know the things that infuse our lives with passion and enthusiasm. We know the things that make us happy. We just don't do them. ... Why? Simple. We are too busy doing what? Too busy trying to be happy [doing other things]".
