what does become more important over time, for both sexes, are two personality traits: openness and mutual trust.

A toxic habit that plagues many marriages is bringing all of one’s negative emotions home because that is where it feels safe to express them. The result is that partners impose a deep negative burden on the one relationship that should bring them the most joy.

a strong long-term pair bond relies on abundant positive emotionality, whereas negativity weakens it.

couples of faith are happier if they grow more religious over the years and practice together.

success of their partnership was largely thanks to developing a high degree of positive emotional behavior. Humor, enthusiasm, and validation—understanding and accepting each other’s feelings and perspectives—were especially important.