Sri Aurobindo
Letters of Sri Aurobindo
Volume IV - Part 3
I have not the slightest doubt that you can do the sadhana if you cleave to it – not certainly on your own unaided strength, for nobody can do that, but by the will of the psychic being in you aided by the Divine Grace. There is a part in the physical and vital consciousness of every human being that has not the will for it, does not feel the capacity for it, distrusts any hope or promise of a spiritual future and is inert and indifferent to any such thing. At one period in the course of the sadhana this rises up and one feels identified with it. That has happened in you now, 
but along with an attack of ill health and nervous indisposition which has turned this passage through the obscure physical into a dark and intense trouble. With enough sleep and a quieting of the nerves and return of physical energy that ought to disappear and it would be possible to bring the Light and Consciousness down into this obscure part. An intense concentration bringing struggle is not what is needed, but a very quiet attitude of self-opening. Not any effort of sadhana just now, but the recovery of tranquillity and ease is what is wanted at present to restore the opening of the nature.