(Nafs al Mutma'inna) is the Self at Peace.The Qur'an refers to this Self, "Oh Self, in complete rest and satisfaction!" (89:27). This Self is tranquil as it rests in the Certitude of Allah. It has been reintegrated into the Spirit. The Nafs al Mutma'inna journeys with Allah. It is equated with the first prostration of the ritual prayer and with the fourth rung (Knowledge of Certainty) on the ladder to Knowledge.