So it is that our heart dilates, our lungs expand. They are bidden by that great and mysterious impulse from the cardiac plexus, which bids them seek the mystery and the fulfillment of the beyond. They seek the beyond, the air of the sky, the hot blood from the dark under-world. And so we live.
And then, they relax, they contract. They are driven by the opposite motion from the powerful voluntary center of the thoracic ganglion.. That which was drawn in, was invited, is now relinquished, allowed to go forth, negatively. Not positively dismissed, but relinquished.
There is a wonderful complementary duality between the voluntary and the sympathetic activity on the same plane. But between the two planes, upper and lower, there is a further dualism, still more startling, perhaps. Between the dark, glowing first term of knowledge at the solar plexus: _I am I, all is one in me_; and the first term of volitional knowledge: _I am myself, and these others are not as I am_;--there is a world of difference. But when the world changes again, and on the upper plane we realize the wonder of other things, the difference is almost shattering. The thoracic ganglion is a ganglion of power. When the child in its delicate bliss seeks the mother and finds her and is added on to her, then it fulfills itself in the great upper sympathetic mode. But then it relinquishes her. It ceases to be aware of her. And if she tries to force its love to play upon her again, like light revealing her to herself, then the child turns away. Or it will lie, and look at her with the strange, odd, curious look of knowledge, like a little imp who is spying her out. This is the curious look that many mothers cannot bear. Involuntarily it arouses a sort of hate in them--the look of scrutinizing curiosity, apart, and as it were studying, balancing them up. Yet it is a look which comes into every child's eyes. It is the reaction of the great voluntary plexus between the shoulders. The mother is suddenly set apart, as an object of curiosity, coldly, sometimes dreamily, sometimes puzzled, sometimes mockingly observed.
Again, if a mother neglect her child, it cries, it weeps for her love and attention. Its pitiful lament is one of the forms of compulsion from the upper center. This insistence on pity, on love, is quite different from the rageous weeping, which is compulsion from the lower center, below the diaphragm. Again, some children just drop everything they can lay hands on over the edge of their crib, or their table. They drop everything out of sight. And then they look up with a curious look of negative triumph. This is again a form of recoil from the upper center, the obliteration of the thing which is outside. And here a child is acting quite differently from the child who joyously _smashes_. The desire to smash comes from the lower centers.