One gains a comprehension of this immersion or sinking down into a percept by calling the Memory-Concept before the soul. Say, for instance, that we allow the eye to rest on a tree, and then turn away from the object so that it is no longer presented to our sight; we shall, nevertheless, be able to retain the image of the tree in the soul. Now this image or perception of the tree which we have when it is no longer in sight, is a recollection of the tree. Then assume that this recollection is retained in the soul, and the soul reposes, as it were, in this recollection, taking care to exclude all other perceptions from the memory. The soul then dwells in that memory-concept of the tree, and we then have to do with the immersion of the soul into a concept. Yet this concept is the image of an actual thing perceived through the senses. If however, of our own free will, we take such images into our consciousness, gradually the effect desired will be attained. One example of meditation based upon a symbolical concept will now be placed before the reader. Such a concept must first be built up in the soul, and this may be done in the following manner. Let us think of a plant, calling to mind how it is rooted in the ground, the way in which leaf after leaf shoots forth, until finally the blossom unfolds. And then let us imagine a human being placed beside this plant, and let us call up in our soul the thought that he has qualities and characteristics which, when compared with those of the plant, will be found to be more perfect. We dwell on the fact that this being is able to move here and there, according to his will and his desires, while the plant remains stationary, rooted in the soil.