Morals, Principles, Value

What is the glue that holds most loving relationships together?  It is similar morals, principles, and values.

Webster's NewWorld Dictionary defines:

Morals: relating to, dealing with, or capable of making the distinction between, right and wrong in conduct.  Good or right in conduct or character.

Principles: A fundamental truth, law, doctrine, or motivating force, upon which others are based.  A natural or original tendency, faculty or endowment.  A rule of conduct, especially of right conduct.

Values:  the social principles, goals, or standards held or accepted by an individual, class, society, etc.  That which is desirable or worthy of esteem for its own sake; thing or quality having intrinsic worth.