Proof that expressions are intrinsic is closer at hand than the South Pacific. As Darwin knew, a congenitally blind baby will smile while interacting pleasurably with his mother. Such a smile comes from a developing creature unable to speak, walk, or even sit up, but he already knows how to express happiness through a configuration of muscular contractions he has never seen on anyone’s face. His knowledge has to be innate.

On the other side of the aisle are evolutionary psychologists and cross-cultural sociologists, who point out that the American habit of sleeping separately is a global and historical singularity. Almost all the world’s parents sleep with their children, and until the last sliver of human history, separate sleep was surpassingly rare. The burden of proof thus falls upon our culture to justify its anomalous nighttime practices.

From birth to death, love is not just the focus of human experience but also the life force of the mind, determining our moods, stabilizing our bodily rhythms, and changing the structure of our brains. The body’s physiology ensures that relationships determine and fix our identities. Love makes us who we are, and who we can become. In these pages, we explain how and why this is so.

The emotional mind likewise transcends the facile and appealing dualism separating its psychological and biological aspects. Physical mechanisms produce one’s experience of the world. Experience, in turn, remodels the neurons whose chemoelectric messages create consciousness. Selecting one strand of that eternal braid and assigning it primacy is the height of capriciousness.

The United States alone sports an inventive spectrum of psychotherapeutic sects and schools: Freudians, Jungians, Kleinians; narrative, interpersonal, transpersonal therapists; cognitive, behavioral, cognitive-behavioral practitioners; Kohutians Rogerians, Kernbergians; aficionados of control mastery, hypnotherapy, neurolingustic programming, eye movement desensitization- that list does not even complete the top twenty. The disparate doctrines of these proliferative, radiating divisions, often reach mutually exclusive conclusions about therapeutic propriety: talk about this, not that; answer questions, or don’t; sit facing the patient, next to the patient, behind the patient. Yet no approach has ever proven its method superior to any other. Strip away a therapist’s orientation, the journal he reads, the books on his shelves, the meetings he attends- the cognitive framework his rational mind demands – and what is left to define the psychotherapy he conducts?

Himself. The person of the therapist is the converting catalyst, not his order or credo, not his spatial location in the room, not his exquisitely chosen words or denominational silences. So long as the rules of a therapeutic system do not hinder limbic transmission - a critical caveat - they remain inconsequential, neocortical distractions. The dispensable trappings of dogma may determine what a therapist thinks he is doing, what he talks about when he talks about therapy, but the agent of change is who he is.

The vocation of psychotherapy confers a few unexpected fringe benefits on its practitioners, and the following is one of them. It impels participation in a process that our modern world has all but forgotten: sitting in a room with another person for hours at a time with no purpose in mind but attending. As you do so, another world expands and comes alive to your senses — a world governed by forces that were old before humanity began.

A good deal of modern American culture is an extended experiment in the effects of depriving people of what they crave most. The consequences that flow from limbic ignorance are as grim as love’s victories are miraculous. The tragedy lies, as all tragedy does, in the knowledge that these sad outcomes once held the potential for greatness. What Charles Dickens wrote of the pair beneath the robe of Christmas Present is true of our society: “Where angels might have sat enthroned, devils lurked, and glared out menacing. No change, no degradation, no perversion of humanity, in any grade, through all the mysteries of wonderful creation, has monsters half so horrible and dread.” Our culture might trade

The person of the therapist is the converting catalyst, not his order or credo, not his spatial location in the room, not his exquisitely chosen words or denominational silences. So long as the rules of a therapeutic system do not hinder limbic transmission - a critical caveat - they remain inconsequential, neocortical distractions. The dispensable trappings of dogma may determine what a therapist thinks he is doing, what he talks about when he talks about therapy, but the agent of change is who he is. (187)

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Many people conceive of evolution as an upward staircase, an unfolding sequence that produces ever more advanced organisms. From this perspective, the advantages of the neocortex — speech, reason, abstraction — would naturally be judged the highest attributes of human nature. But the vertical conceptualization of evolution is fallacious. Evolution is a kaleidoscope, not a pyramid: the shapes and variety of species are constantly shifting, but there is no basis for assigning supremacy, no pinnacle toward which the system is moving. Five hundred million years ago, every species was either adapted to that world or changing to become so. The same is true today. We are free to label ourselves the end product of evolution not because it is so, but because we exist now. Expunge this temperocentrist bias, and the neocortical brain is not the most advanced of the three, but simply the most recent.

In a relationship, one mind revises another; one heart changes its partner. This astounding legacy of our combined status as mammals and neural beings is limbic revision: the power to remodel the emotional parts of the people we love, as our Attractors activate certain limbic pathways, and the brain’s inexorable memory mechanism reinforces them. Who we are and who we become depends, in part, on whom we love.

you might think that treatments like group therapy after breast cancer would now be standard. Guess again. Affiliation is not a drug or an operation, and that makes it nearly invisible to Western medicine. Our doctors are not uninformed; on the contrary, most have read these studies and grant them a grudging intellectual acceptance. But they don’t believe in them; they can’t bring themselves to base treatment decisions on a rumored phantom like attachment. The prevailing medical paradigm has no capacity to incorporate the concept that a relationship is a physiologic process, as real and as potent as any pill or surgical procedure.

Loving is limbically distinct from in love. Loving is mutuality ; loving is synchronous attunement and modulation. As such, adult love depends critically upon knowing the other. In love demands only the brief acquaintance necessary to establish an emotional genre but does not demand that the book of the beloved’s soul be perused from preface to epilogue. Loving derives from intimacy, the prolonged and detailed surveillance of a foreign soul.