Inner Motivator or Controller. (God is described thus because He resides in all beings and controls them from within). (SSS Vol.1, p. Glossary)
The Inner Motive Force. The immanent spirit in the body-complex abode, the mystery that is beyond the reach of that complex, the motivating force of the impulses and intentions of that complex; that Antharyami has no death; It is, Atma. (JV, p. Glossary)