The two kidneys embody active and passive trust in God, taking initiative and relying solely on God.
More generally, the endocrine and immune systems correspond to the active and passive trust in God.
The psychological drive for self-fulfillment is embodied in the organ of procreation, the covenant.
In Kabbalah, sex and six are related – sex corresponds to the sixth emotive attribute of the soul.
The sixth emotive attribute of the soul is called foundation. Its inner experience is realization.
Physically, a male is an extrovert and a female an introvert. But spiritually, they inter-include.
Feminine energy is referred to as kingdom. It rules reality. It transforms infinity to finitude.
Male energy channels infinite light to the place where it can be transformed into finite radiance.
The difference between male and female, 227 and 157, is 70. The linear series begins from 17, good.
The male-female series (17 plus 70's) reaches 2187 = 3 to the 7th, male mind, 3, to female heart, 7.