Open and unhindered communication is a process that builds up trust in a marital relationship; with or without trust, commitment is not guaranteed. The degree to which you prioritize your relationship with your partner is the degree to which you communicate with him or her.
Communication is what blood is to the body in a marital relationship, meaning that communication is the lifeline of a marital relationship. Once it is bridged, frustration is inevitable in such a relationship. More reason, intimate partners have to do all they can to continuously prioritize communication in their relationship. There should not be any issue too difficult for them to discuss with one another, bearing in mind that the communication process is not complete without feedback.