As for the statement of truth believed by the Monotheists: it is that within human bodies there resides a light from the Light of Divinity, which is Muhammad.

This is the spiritual soul attributed to the Intellect and faith, because it never sleeps, never grows ignorant, and never enters into forbidden matters.

The proof of this is that when a human being intends to commit an ugly deed, there emerges from within his own self a commander and a forbidder. The one commanding corruption is the enticing self (al-nafs al-musawwilah), while the one forbidding it is the spiritual soul, which is the essence of the Path attributed to the Intellect and faith. If he persists in committing the detestable act, the spirit—the spirit of the Intellect—departs from him and leaves him, so he executes what he intended. Once [that is completed by him] , the spirit of the Intellect returns to show him the evil of his deed, whereupon he is overcome by regret and self-reproach and if God censures him swiftly, he blames himself, saying: "O self, how often [do I rebuke you] ¹