The Principles represent pure knowledge and spiritual reality, but are uncreative and incapable of making new material, only of understanding what life offers. They remain in the unconscious mind during waking life, and are partially responsible for our dream life, coming to the fore after death, where the individual needs to understand and absorb the fruits of the preceding life before carrying on to the next life. The Principles are Solar in relation to the Faculties and are intrinsically hierarchical, unlike the Lunar Faculties. Between themselves, the two Solar Principles, Spirit and Celestial Body are permanent and represent the continuity between lives, while the two Lunar Principles, Husk and Passionate Body are impermanent, acquired afresh before each new life.