Sri Aurobindo
Letters of Sri Aurobindo
Volume III - Part 2
No, it was neither optical illusion nor hallucination nor coincidence nor auto-suggestion nor any of the other ponderous and vacant polysyllables by which physical science tries to explain away or rather avoid explaining the scientifically inexplicable. In these matters the scientist is always doing what he is always blaming the layman for doing when the latter lays down the law on things about which he is profoundly ignorant, without investigation or experiment, without ascertained knowledge – simply by evolving a theory or a priori idea out of his own mind and plastering it as a label on the unexplained phenomena.
There is, as I have told you, a whole range or many inexhaustible ranges of sensory phenomena other than the outward physical which one can become conscious of, see, hear, feel, smell, touch, mentally contact – to use the new established Americanism – either in trance or sleep or an inward state miscalled sleep or simply and easily in the waking state. This faculty of sensing supraphysical things internally or externalising them, so to speak, so that they become visible, audible, sensible to the outward eye, ear, even touch, just as are gross physical objects, this power or gift is not a freak or an abnormality; it is a universal faculty present in all human beings, but latent in most, in some rarely or intermittently active, occurring as if by accident in others, frequent or normally active in a few. But just as anyone can with some training learn science and do things which would have seemed miracles to his forefathers, so almost anyone, if he wants, can with a little concentration and training develop the faculty of supraphysical vision. When one starts Yoga, this power is often though not invariably – for some find it difficult – one of the first to come out from its latent condition and 
manifest itself, most often without any effort, intention or previous knowledge on the part of the sadhak. It comes more easily with the eyes shut than with the eyes open, but it does come in both ways. The first sign of its opening in the externalised way is very often that seeing of “sparkles” or small luminous dots, shapes etc. which was your first introduction to the matter; a second is, often enough, the seeing of circles of light or colour round objects, most easily round luminous objects like a star; seeing of colours is a third initial experience – but they do not always come in that order. The Yogis in India very often in order to develop the power use the method of trāṭak, concentrating the vision on a single point or object – preferably a luminous object. Your looking at the star was precisely an exercise in trāṭak and had the effect which any Yogi in India would have told you is normal. For all this is not fancy or delusion; it is part of an occult science which has been practised throughout the historic and prehistoric ages in all countries and it has always been known to be not merely auto-suggestive or hallucinatory in its results, but, if one can get the key, veridical and verifiable. Your first scepticism may be natural in a “modern” man plunging into these lasting things of the past, present and future,– natural but not justifiable because very obviously inadequate to the facts observed; but once you have seen, the first thing you should do is to throw all this vapid pseudo-science behind you, this vain attempt to stick physical explanations on supraphysical things, and take the only rational course. Develop the power, get more and more experience – develop the consciousness by which these things come: as the consciousness develops, you will begin to understand and get the intuition of the significances. Or if you want their science too, then learn and apply the occult science which can alone deal with supraphysical phenomena. As for what showed itself to you, it was not mere curious phenomena, not even merely symbolic colours, but things that have a considerable importance.
Develop this power of inner sense and all that it brings you. These first seeings are only an outer fringe – behind lie whole worlds of experience which fill what seems to the material 
man the gap (your Russell’s inner void) between the earth-consciousness and the Eternal and Infinite.