1) you have to open up your psyche, your mental/emotional/physical body to hidden places, frozen zones, areas where movement has stopped and the birds been frozen in the sky.
2) having touched those feelings, and the thoughts which come from them, and the physical sensations which they give rise to, you have to learn to transform them into positive energy. You have to reinvent yourself.
These two stages are psychological, and could be said to consist in healing, but healing is really just growth from a place of being incomplete, so I tend to prefer the term growth or a synonym.
3) you have to learn to do this with ALL experience, continually. You have to both remain aware what is going on in you, and be able to transform it on an on-going basis. You have to reinvent yourself continually, which means you cannot be too attached to any one form. This is, as I think I have argued repeatedly, the basis of the Buddhist Anatta, or Anatman.
This process is spiritual, or at least I think that is the best term for it.