The one transgressing is called ignorant, and his transgression ignorance. These are the intrinsic limits of things. They are ascribed to God only because our knowledge of them came from God's side, when He gave us the faculty of intellect and reflection through which we attain knowledge of these limits.
Furthermore, the affairs we define are nothing additional to what appears within intelligible and sensory loci of manifestation. None has appeared but the Real. What appears within intellect or sense is what we define, and it is none but God. They are therefore God's limits.
(Sharing and the Constitutive Differentia)
Things defined may share some features and be distinguished through others. The differentiae through which they are distinguished constitute the limit distinguishing them from what shares features with them. Everything through which sharing and distinction occur is their limit. Whoever transgresses these limits ﴿has wronged himself﴾ [al-Ṭalāq 65:1] with a wrong called ignorance and reversing realities.
Reversing realities may reverse their entire entity, or may reverse them through their constitutive differentiae. However it is done, one has transgressed God's limits and been ignorant. He defines the Creator through what defines the creature, reversing the whole affair in its very entity. He may define the human being through the horse's constitutive differentia, erring, ignorant of something and knowing something. Those are truly the ignorant, just as in transgressing
