The Jivatman, spark-soul and psychic being are three different forms of the same reality and they must not be mixed up together, as that confuses the clearness of the inner experience.
   The Jivatman or spirit, as it is usually called in English,-is self-existent above the manifested or instrumental being -it is superior to birth and death, always the same, the individual Self or Atman. It is the eternal true being of the individual.
  The soul is a spark of the Divine which is not seated above the manifested being, but comes down into the manifestation to support its evolution in the material world. It is at first an undifferentiated power of the Divine Consciousness containing all possibilities which have not yet taken form, but to which it is the function of evolution to give form. This spark is there in all living beings from the lowest to the highest.
   The psychic being is formed by the soul in its evolution. It supports the mind, vital, body, grows by their experiences, carries the nature from life to life. It is the psychic or caitya purusa. At first it is veiled by mind, vital and body, but as it grows, it becomes capable of coming forward and dominating the mind, life and body; in the ordinary man it depends on them for expression and is not able to take them up and freely use them. The life of the being is animal or human and not divine. When the psychic being can by sadhana become dominant and freely use its instruments, then the impulse towards the Divine becomes complete and the transformation of mind, vital and body, not merely their liberation, becomes possible.
   The Self of Atman being free and superior to birth and death, the experience of the Jivatman and its unity with the supreme or universal Self brings the sense of liberation, it is this which is necessary for the supreme spiritual deliverance: but for the transformation of the life and nature the awakening of the psychic being and its rule over the nature are indispensable.

  The psychic being realises its oneness with the true being, the Jivatman, but it does not change into it.
  The bindu seen above may be a symbolic way of seeing the Jivatman, the portion of the Divine; the aspiration there would naturally be for the opening of the higher consciousness so that the being may dwell there and not in the Ignorance. The Jivatman is already one with the Divine in reality, but what is needed is that the rest of the consciousness should realise it.
  The aspiration of the psychic being is for the opening of the whole lower nature, mind, vital, body to the Divine, for the love and union with Divine, for its presence and power within the heart, for the transformation of the mind, life and body by the descent of the higher consciousness into this instrumental being and nature.
  Both aspirations are essential and indispensable for the fullness of this yoga. When the psychic imposes its aspiration on the mind, vital and body, then they too aspire and this is what was felt as the aspiration from the level of the lower being. The aspiration felt above is that of the Jivatman for the higher consciousness with its realisation of the One to manifest in the being. Therefore both aspirations help each other. The seeking of the lower being is necessarily at first intermittent and oppressed by the ordinary consciousness. It has, by sadhana, to become clear, constant, strong and enduring.

SRI AUROBINDO

In the experience of yoga the self or being is in essence one with the Divine or at least it is a portion of the Divine and has all the divine potentialities. But in manifestation it takes two aspects, the Purusha and Prakriti, conscious being and Nature. In Nature here the Divine is veiled, and the individual being is subjected to Nature which acts here as the lower Prakriti, a force of Ignorance, Avidya. The Purusha in itself is divine, but exteriorised in the ignorance of Nature it is the individual apparent being imperfect with her imperfection. Thus the soul or psychic essence, which is the Purusha entering into the evolution and supporting it, carries in itself all the divine potentialities; but the individual psychic being which it puts forth as its representative assumes the imperfection of Nature and evolves in it till it has recovered its full psychic essence and united itself with the Self above of which the soul is the individual projection in the evolution. This duality in the being on all its planes -for it is true in different ways not only of the Self and the psychic but of the mental, vital and physical Purushas has to be grasped and accepted before the experiences of the yoga can be fully understood.
  The Being is one throughout, but on each plane of Nature, it is represented by a form of itself which is proper to that plane, the mental Purusha in the mental plane, the vital Purusha in the vital, the physical Purusha in the physical. The Taittiriya Upanishad speaks of two other planes of the being, the Knowledge or Truth plane and the Ananda plane, each with its Purusha, but although influences may come down from them, these are superconscient to the human mind and their nature is not yet organised here.

SRI AUROBINDO