(Shirk). To associate or join a partner (another reality) with Allah. Shirk is the one unforgivable sin. It is in opposition to the very basis of Islam which is Unity (tawhid).
(Shirk Khafi). The great idol of all worship is the 'I-ness' or 'existence' of the worshipper. Until his existence is annihilated in That Which Truly Exists, Allah, he will be guilty of Hidden Association.
