Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 3
There is no utility in such experiences; they may happen on the vital plane so long as one has still to pass through the vital range of experiences, but the aim should be to get beyond them and live in a pure psychic and spiritual experience. To admit or call the invasion of others into one’s own being is to remain always in 
the confusions of the intermediate zone. Only the Divine should be called into one’s personal adhar – by which is not meant the loss of one’s personal being or any idea of becoming the Divine, for that should be avoided. The ego has to be overcome, but the central personal being (which is not the ego but the individual self, soul, a portion of the Divine) has to remain a channel and instrument of the Divine Shakti. As for others, sadhaks etc. one can feel them in one’s universalised consciousness, be aware of their movements, live in harmony with them in the Divine All, but not allow or call their presence within the personal adhar. Very often that leads to the invasion of the consciousness by vital powers or presences which assume the forms of those who are so admitted – and that is most undesirable. The sadhak must make his basic consciousness silent, calm, pure, peaceful and preserve or attain an absolute control over what he shall or shall not admit into it – otherwise, if he does not keep this control, he is in danger of becoming a field of confused and disorderly experiences or a plaything of all sorts of mental and vital beings and forces. Only one rule or influence other than one’s own should be admitted, the rule of the Divine Shakti over the adhar.