   Averroes held to the view of the Agent Intellect as a form of (earthly) forms throughout his life, though his understanding of the relationship between it and the forms on earth underwent change. While first thinking the Agent Intellect an emanative substance that bestowed forms on all sub-lunar substances, he later regarded it in Aristotelian terms simply as an efficient cause of intellection, “illuminating” or actualizing both the potentially intelligent subject and intelligible  object.[63] However, as the ultimate object of humanity's quest for knowledge, the Agent Intellect served as a final cause of intellection, conjunction with it offering a person the greatest felicity (sa‘âdah) one's soul could have.