Nefesh HaChayim, Reb Itzele's Long Annotation

And even when we see the body’s actions that proceed from the combination of the four humors, lo, the elements are not revealed to us to perceive. It’s only from the revealed actions can we deduce the extent of their combination in the spiritual, as explained in Zohar Yitro on the verse “and you shall discern” (Shemot 18:21)452This refers to the ability to perceive the effects of the combinations of the elements in a person’s face and hands., and in Tikkoonei Zohar and in Zohar Chaddash. And for that reason they stated in the Zohar and in the Ariza”l’s writings that tzellem is from the aspect of hidden worlds, while d’moot is from the aspect of the revealed worlds. They also stated that the tzellem is male and d’moot is female, being the active and passive power.