The physical body can be divided into two divergent fields of psychic activities. The portion above the navel, upto the top of the head is the field of wisdom and that below the navel is the field of passions and sex. The conscious action is concentrated sometimes in one field and sometimes in the other. The flow of vital energy generally follows the conscious action. The field of passion is the main source of creative energy of libido and the conscious action of man is normally more concentrated in this field than in the field of wisdom. This is because libido is a primal drive and the average man, today, is constantly subjected to tremendous sexual excitement.
Thus most of the time the conscious action is concentrated in the nether field. According to the psychologists, sexual urge is the most powerful and the most persistent of all instincts in man. The stress of other instincts is much less frequent - at times fear, sometimes anger, occasionally jealousy and haughtiness and so on, but he is never entirely free from the stress of sexual excitement and the resultant tensions are very deep rooted.
Besides pleasure, the field of passion is also the center for misery and cruelty. One suffers misery due to loss of some beloved possession or due to undesirable association. Pleasant and unpleasant sensations are produced in this center.
Suffering from pain, efforts to remove pain, cruelty, jealousy, hatred are all expressions of this center.