   The intellect, considered as purely immaterial, has no physical organ to sustain it, unlike the other faculties of the soul. As Alexander of Aphrodisias, Farabi identifies the heart as the “ruling organ” of the  body.[15] Assisted by the brain, liver, spleen and other organs, the heart provides the innate heat that is required by the nutritive faculty, senses and imagination (Walzer, 175–187).