THE CLOUD OF UNKNOWING - CHAPTER 65
Of the first secondary power, Imagination by name; and of the works and the obedience of it unto Reason, before Sin and after.
In Chapter 63, our author called some powers of the mind principle and some secondary, and in Chapter 64 he discussed the principle ones. In this chapter he discusses the first secondary power of the mind, imagination.
I think our author's intention in these few chapters is to leave the topic of the exercise for as briefly as possible to give us just the barest sketch of psychology needed for us to understand how our mind can deceive us in the working of this exercise. That makes it interesting that he has given us a chapter each about these "secondary" powers of the mind, and combined the principle powers in one chapter. In these chapters on the secondary powers, he tells us the difference in how they function after original sin as compared with before.