Many later thinkers in the Islamic world pick up on, and further expand, the idea of intuition (ḥads) as they react to Avicenna (Ibn Sīnā). Focusing on figures from the twelfth–thirteenth century, in this paper we will focus especially on the following points of debate: (1) Avicenna’s idea that intuition is distingiushed from normal (discursive) thought by lacking ‘motion’, (2) The question of how and why different individuals differ in the extent of their intuition, (3) The role of intuitive thought (...) in grounding knowledge: is intuition needed every time a certain item of knowledge is grasped for the first time, and hence without a teacher; and further, is intuition needed as an ultimate justification for all non-intuitive knowledge? (shrink)