The aim of the existence of all mankind is “to progress from being in the image of God to being in His likeness” (Met. Hierotheos. 2010. The science of spiritual medicine, p. 95) – that is, to achieve deification through full participation in Divine grace, the divine energies. The illness of our souls, that prevents deification and leads us to sin, is a consequence of the darkening of the heart of our souls, the nous. Hence, the healing of our souls is through purification and the illumination of the nous, in order that the deification of man can commence.