 It seems, therefore, that al-Fārābī has a strict conception of demonstrative science inspired by Aristotle’s Posterior Analytics. Nevertheless, although al-Fārābī gives demonstration and absolute certainty a relevant place in his conception of philosophy, he also considers that our knowledge is not limited to absolute certainty. He also takes into consideration other forms of knowledge that can lead us to what should be called non-necessary certainty, as is the case with the different kinds of knowledge we attain by means of the non-demonstrative logical arts. In this regard, al-Fārābī considers that from the different kinds of arguments we can conceive different degrees of certainty and therefore, different kinds of beliefs (from absolute certainty to non-necessary certainty or strong belief).