This term comes from Sufi tradition and refers to one's built-in tendency towards either 'felicity' vs. 'wretchedness' or 'grace' vs. 'sin.'
This corresponds roughly to the Cassiopaean notion of consciousness energy director. This is the factor determining the binding between the entity and the realm the entity occupies. This corresponds to both density as well as to the STO/STS duality.
At the level of human psychology, such a nature could be seen in one's basic disposition towards either being giving or empathic or on the other hand selfish.