For in the Spirit-World there is Reality; as the process of differentiation proceeds, illusion is produced, and it is this mind, this growing mind, that makes the illusion. It is this growing mind that has endless images and pictures, that has the image-making faculty which we speak of as imagination, that has the reasoning faculty which builds on the airy picture that it has made- it is this which is the real creator of illusion, it is this which slays the Real, so far as the disciple is concerned, and his first work as disciple will be to slay the slayer.