We belong to that order of mammals, the primates, distinguished by its propensity for repeated single litters, intense parental care, long life-spans, late sexual maturity, and a complex and extensive social existence... Our protracted biological and psychological helplessness, which extends well into the third year of life, intensifies the bond between infant and parents, making possible a sense of generational continuity. In contrast to other primates these bonds are not obliterated after sexual maturity.

We humans, once we have become emotionally invested in a homeplace, a prized personal possession, or, especially, in another person, find it immensely difficult to give them up....Because they were made at a time of life when we were utterly dependent on them, the love attachments of infancy have inordinate power over us, more than any other emotional investment.

It didn't take elaborate experiments to deduce that an infant would die from want of food. But it took centuries to figure out that infants can and do perish from want of love.

It is a human circumstance that when we are born we have not yet come into existence. We are lured into our special human existence by a mothering presence that gratifies our innate urges to be suckled, held, rocked, caressed. But that same gratifying presence puts limits on desire and rations satisfaction. In this sense the mother is also the first lawgiver.

As he walks away on his own two feet--the toddler's body-mind has reached its moment of perfection. The world is his and he the mighty conqueror of all he beholds.... As long as mother sticks around in the wings, the mighty acrobat confidently performs his trick of twirling in circles, walking on tiptoe, jumping, climbing, staring, naming. He is joyous, filled with his grandeur and wondrous omnipotence.

What eleven- to thirteen-year-old boys fear is passivity of any kind. When they do act passively we can be fairly certain that it is an act of aggression designed to torment a parent or teacher. . . . Mischief at best, violence at worst is the boy's proclamation of masculinity.

We humans undergo two major growth spurts: one during infancy and another from eleven to twelve until fifteen or sixteen--pubescence. Between the two is a relatively quiescent growth period in which most of the body takes a rest from growing while the brain continues to mature. This period of life is general referred to as childhood or, sometimes, latency.