Everyone wants a happy marriage. The best way to ensure a happy marriage is to master the ability to experience joy in your life with each moment of growth. And each moment is an opportunity to grow. There are many forms of growth in marriage. Growth can mean you are happy with your marriage and constantly grateful to G-d. Growth can mean that you have a partnership that is eternal for both of you. Growth can mean that you are increasing your appreciation for doing acts of kindness. Growth can mean that you are improving in your character traits. Growth can mean that you act in an elevated manner even though things are difficult. Growth can mean that you develop resources to turn around a difficult situation. Growth can mean that you transcend your natural tendencies in order to be compassionate and forgiving.
Growth can mean that you make sacrifices for the benefit of your spouse and children. Growth can mean that you sustain a loving and respecting manner - even though this may not be reciprocated. Growth can even mean that you have the courage to end an abusive situation. Growth always means that you act according to G-d's will.
Growth always means that the Torah is your guide for which patterns of speech and action to increase... and which to eliminate from your repertoire.
(From Rabbi Pliskin's book entitled "Marriage" - ArtScroll Publications, 1998, Chapter One, pp. 61-2)