Causeless Cause (or Uncaused Cause, All-Cause) in Theosophy, is 'An Omnipresent, Eternal, Boundless, and Immutable Principle...' also described as 'infinity' to (impersonal) 'intelligence' & (divine) 'spirit' & 'consciousness' (but also non-consciousness or at least unconsciousness) & 'essence' to 'the one life.'[1]
Causeless cause is synonymous with 'the absolute,' which 'Protologos' is often confused with, but it is not: 'first' (Gk. 'proto') denotes finite bound, but causeless cause is unbounded. Hindus and Theosophists call it Para Brahman (Parabrahm.) Formless Parabrahm is said to periodically emanate Logoi, which are hence not causeless, but are non-eternal except in cycles of emanation, existence, pralaya (dissolution.) In each cycle, causeless cause causes the Logoic Monad to move into action, which develops into the Logoic Triad/triple manifestation, and the heptad (i.e. seven; prajapatis (Devas) or Elohim,) which continue the cosmic chain of cause and effect. It has been shown the causeless cause is so described in some religious cosmogenesis accounts.
The ideas of causeless and Logoic causes are said to enable various logic. Their ideas are used in unification of metaphysics/theology--it is said such ideas are easier to understand with all symbology (seven keys) i.e. specific 'sacred sciences' fully used mainly in the East.