in the child, the deeper sensual centers aroused, but finding no correspondent, no objective, no polarized connection with another person. There they are, the powerful centers of sex, acting spasmodically, without balance. They must be polarized somehow. So they are polarized to the active upper centers within the child, and you get an introvert.

This is how introversion begins. The lower sexual centers are aroused. They find no sympathy, no connection, no response from outside, no expression. They are dynamically polarized by the upper centers within the individual. That is, the whole of the sexual or deeper sensual flow goes on upwards in the individual, to his own upper, from his own lower centers. The upper centers hold the lower in positive polarity. The flow goes on upwards. There must be some reaction.