The TWO 'CO-ESSENTIAL FACTORS' necessary for a Truly Fulfilling Life are (1) BEING; (i.e. 'Self-Being,' 'Being-for Oneself; 'One's OWN 'Self-Self' Relationship), and (2) BELONGING; Relationship to OTHERS, and more specifically; ONE Particular Beloved Other Person, (e.g. 'Husband'; 'Wife'; - 'Lover and Beloved' Relationship).
The above factors are made effective in the context of Family, and elsewhere, through Genuine Human-Spiritual Communication; Including, so-called, 'Emotional Honesty' (i.e. Truthful communications (on every level) - as opposed to mis-communications; (communications that 'miss the mark' so to speak - ( anywhere from outright lies, deceptions, to more subtle 'tangential' remarks etc.).
'Missing the Mark' is actually a very good metaphorical starting point in our discussion of ALL forms of possible 'communication' within a 'two-person' 'Marriage' relationship, as well as in the context of 'Family' more generally - that is, when children 'enter the picture.' This almost inevitable occurrence can totally transform, as well as redefine, the whole 'nexus' of relations; firstly between the parents, (both internally, and externally) as well as those between parents and children, children and children!
In the context of 'Marriage Life', I think it fair to say that without a definite commitment to 'Marriage' - as a 'Spiritual Enterprise' - and this commitment, fundamentally on the level of an implicit, as well as, explicit 'marriage vow' - that is, a mutual commitment to TRUTH on every level of relationship; the probability for on-going mis-communications, (compounding, over time, mutual mis-understanding) is exponentially much higher.
As paradoxical as it may seem, it would appear that a prior experience of belonging; an experience in early childhood of total acceptance, in the first instance, in relationship to one's 'Mother' or 'Primary care giver' is the sine qua non of one's own sense of Autonomous BEING, later in Life. This TOTAL ACCEPTANCE; This EXPERIENCE of un-conditional LOVE; of Total Belonging, to ANOTHER Human Being like oneself provides the BASIS for what has been called Primary 'Ontological Security.' (See, Laing, R.D., The Divided Self, 1960; Self and Others, 1961).
This inter-dependent (dialectical) relationship between BEING, and BELONGING, is very much brought into play in what I like to call the crucible, provided by the 'two-partner arrangement' of 'Marriage as a Spiritual Enterprise.' (See initial post to this site).