In a relationship, one mind revises another; one heart changes its partner. This astounding legacy of our combined status as mammals and neural being… - Thomas Lewis

Who we are and who we become depends, in part, on whom we love.

Long-standing togetherness writes permanent changes into a brain's open book. In a relationship, one mind revises another; one heart changes its partner. (144)

Love is simultaneous mutual regulation, wherein each person meets the needs of the other, because neither can provide for his own.

Being well regulated in relatedness is the deeply gratifying state that people seek ceaselessly in romance, religions, and cults; in husbands and wives, pets, softball teams, bowling leagues, and a thousand other features of human life driven by the thirst for sustaining affiliations.

But dividing the mind into “biological” and “psychological” is as fallacious as classifying light as a particle or a wave. The natural world makes no promise to align itself with preconceptions that humans find parsimonious or convenient.