Sri Aurobindo has identified various stages in the progression beyond the mental consciousness to the full emergence of the supramental consciousness. The terms he has created for these start with Higher Mind, then move to Illumined Mind, Intuitive Mind and Overmind. Each stage is characterized by a significant alteration in the methods of perception, knowing and expressing force of action, or will. The Illumined Mind goes beyond the Higher Mind in that it is not any longer a mind-based framework, but acts more from seeing and knowing rather than logically building any linear and fragmented knowledge-form.
Sri Aurobindo observes in The Life Divine: “This greater Force is that of the Illumined Mind, a Mind no longer of higher Thought, but of spiritual light. Here the clarity of the spiritual intelligence, its tranquil daylight, gives place or subordinates itself to an intense lustre, a splendour and illumination of the spirit: a play of lightnings of spiritual truth and power breaks from above into the consciousness and adds to the calm and wide enlightenment and the vast descent of peace which characterise or accompany the action of the larger conceptual-spiritual principle, a fiery ardour of realisation and a rapturous ecstasy of knowledge. A downpour of inwardly visible Light very usually envelops this action; for it must be noted that, contrary to our ordinary conceptions, light is not primarily a material creation and the sense or vision of light accompanying the inner illumination is not merely a subjective visual image or a symbolic phenomenon: light is primarily a spiritual manifestation of the Divine Reality illuminative and creative; material light is a subsequent representation or conversion of it into Matter for the purposes of the material Energy. There is also in this descent the arrival of a greater dynamic, a golden drive, a luminous ‘enthousiasmos’ of inner force and power which replaces the comparatively slow and deliberate process of the Higher Mind by a swift, sometimes a vehement, almost a violent impetus of rapid transformation.”
“The Illumined Mind does not work primarily by thought, but by vision; thought is here only a subordinate movement expressive of sight. The human mind, which relies mainly on thought, conceives that to be the highest or the main process of knowledge, but in the spiritual order thought is a secondary and not indispensable process.”
“A consciousness that proceeds by sight, the consciousness of the seer, is a greater power for knowledge than the consciousness of the thinker. The perceptual power of the inner sight is greater and more direct than the perceptual power of thought: it is a spiritual sense that seizes something of the substance of Truth and not only her figure; but it outlines the figure also and at the same time catches the significance of the figure, and it can embody her with a finer and bolder revealing outline and a larger comprehension and power of totality than thought-conception can manage.”
Sri Aurobindo, The Future Evolution of Man, Chapter Seven, The Ascent Towards Supermind, pp. 87-88
Sri Aurobindo Studies 