The Essence of Islam – Volume II — Page 186
186. Essence of Islam II pure being who is also called the Spirit of Truth and. Light, calls every heart to goodness and virtue through holy emotions and inner attention. To the degree to which anyone develops love and relationship with him, he is bestowed the faculty of faith and light spreads in his heart so that he takes on his colour and acquires by way of reflection all those excellencies that belong to him. . The influence of the being who incites towards evil, that is to say, Satan, whose station is the extreme lowest point, pulls everyone whose heart has any relationship with him, towards shirk. To the degree to which anyone establishes a relationship with him, to that degree his thinking turns to disbelief and wickedness so that when he acquires a complete resemblance to him he takes on his colour and becomes a complete Satan and acquires all the grades of wickedness which belong to Satan. In the same manner, the friends of Raḥmān and the friends of. Satan are pulled in different directions according to their relationship. [Surmah Chashm Āryā, Rūḥānī Khazā'in, vol. 2, pp. 248-251, footnote]