Emotions and feelings are primarily sensations, and these are sensations of the body. If the body is insensitive, there will be no awareness of these sensations and hence no awareness of feelings. This will preclude the possibility of understanding. So sensitization of the body is required via the dissolution of muscular armor and its tension patterns.
But the sensitization of the body is not just for the awareness of sensations and feelings. These are the first to be encountered by the expanding awareness. But the sensitivity, in time, needs to get deeper, and the perceptions need to get finer so that the organism can be aware of the subtler presence of essence itself. Essence is an embodied existence and will be experienced in the body, not somewhere else or abstractly – Essence with the Elixir of Enlightenment: The Diamond Approach to Inner Realization, Ch. 5