Note 10:3 — PART I. Pre-Islamic Persian Philosophy.
Reading edition
The Ṣūfī conception of the soul is also tripartite. According to them the soul is a combination of Mind, heart and spirit (Nafs, Qalb, Rūḥ). The "heart" is to them both material and immaterial or, more properly, neither—standing midway between soul and mind (Nafs and Rūḥ), and acting as the organ of higher knowledge. Perhaps Dr. Schenkel's use of the word "conscience" would approach the ṣūfī idea of "heart".