The central communication skill in harmonious relationships is telling the truth. There are many benefits from being able to tell the bottom line truth to your partner. First, it increases liveliness in each partner and in the relationship; clear, truthful communication opens a deeper Love and flow of intimacy. Second, clear communication that sticks to basic sensations and individual experience prevents argument.
As discovered through Soul Expansion, in order to live your life in the present, you will need to learn to become assertive. You have to learn to advocate for yourself and your needs and wants, and recognize the needs and wants of others. This is very different from being aggressive or overly-demanding; both of those deal with ego. Assertiveness deals with self-love, and advocating for yourself in a healthy, productive, and proactive manner.