 Jaʿfar aṣ-Ṣādiq (d. 765, notably an Imām) described this connection as a realisation that God loves some, that God is truth and that only "‘ilm" "sacred knowledge" and its development can help humanity fulfil its potential.His son, Imām Mūsà al-Kāżim (d. 799), expanded this exegesis by defining ‘aql as the "faculty for apprehending the divine, a faculty of metaphysical perception, a light in the heart, through which one can discern and recognize signs from God.