   While this statement is not repeated in his other two commentaries on De anima, Averroes' belief in the attainment of personal perfection through knowledge of the Agent Intellect remained constant. Every cognition of an intelligible is an act of identification of subject and object, no material barrier existing between  them.[62] Knowledge of the Agent Intellect, however, is thought to surpass everything else, its content uniquely and totally comprehensive. The species of all forms on earth are found unified in it in a way that renders it a single intelligible being.