Soul/Shōki

Shōki (正気; lit. "Mind") represents a person's wisdom. It should be noted that wisdom and intelligence aren't the same -- even if the two are often associated with one another. By virtue of representing a spirit's wisdom, the Shōki is the part of the soul that governs one's maturity, their philosophical outlook of life, and their overall experience in dealing with spirituality.

Overview
According to scholars, Shōki is the most evident in those capable of using mentally or spiritually-based attacks, such as genjutsu or hexes. In addition, those who are noted to be extremely philosophical - such as monks, who often stay in a state of meditation - are said to also have extremely potent Shōki. Overall, this aspect of the soul is closely related to your mind.

It represents not only your wisdom, but your consciousness, and is responsible for ensuring that a person is sentient. Non-sentient beasts, as a result, lack this refinement in their soul, making them animals solely of intellect, or instinct. Those with advanced Shōki are quite resistant to non-tangible assaults, and seem to possess great fore-sight.

Like many other aspects of the soul, the location of the Shōki among a person's spirit is uncertain. However, it's theorized that this component lingers adjacently with the Genki, as a person's overall quantity of spiritual energy is directly related to a person's wisdom, or Shōki.