Marriage expresses a love that is freely given, that involves not only the physical but the whole person, heart, mind, soul and strength. It is a love that is not self-serving, but is instead sacrificial, always seeking the highest good of their spouse, and is freely given, unmerited and unconditional.
In marriage, husband and wife begin a new life together. The bible says that a man will leave his mother and father and be united to his wife, becoming one flesh. There is a joining, a cleaving, a uniting of two as they become one couple, both with their individual traits and personalities respected.