 It has been mentioned that it is through the intellect that human beings know intelligibles, attain the sciences and the arts, and discern and reflect on practical matters. In The Treatise on the Intellect, known in Latin as De intellectu, al-Fārābī provides a complete account of the different senses of the term ‘aql (νοῦς, intellect or reason) starting with (1) the use that most people have given to the term, then (2) the way in which Islamic theologians have used it and, (3) finally, the different senses it has in Aristotle’s works, concretely, in Posterior Analytics, Nicomachean Ethics, On the Soul, and Metaphysics (al-Fārābī LI: 3–4; OI: 68). 