199. All processes of perfection increase and rise by and according to levels. I have already explained that there are two kinds of level, horizontal and vertical, in 184-188 above. I have explained that the horizontal levels are like levels of light tending toward darkness or wisdom tending toward ignorance, while vertical levels are like those of a purpose, a means, and a result, or like something antecedent, something subsequent, and something final. These latter levels are described as rising and falling, since they involve height; while the former are described as waxing and waning because they involve width.
These levels are so different from each other that they have nothing in common; so they need to be grasped clearly and not confused with each other in any way.