Sri Aurobindo
Letters of Sri Aurobindo
02. The Triple Transformation: Psychic – Spiritual – Supramental
The substance of knowledge is the same on all the overhead planes, but the higher mind gives only the substance and form of 
knowledge in thought and word – in the illumined mind there begins to be a peculiar light and energy and Ananda of knowledge which grows as one rises higher in the scale – or else as the knowledge comes from a higher and higher source. This light etc. are still rather diluted and diffused in the illumined mind; it becomes more and more intense, clearly defined and dynamic and effective on the higher planes so much so as to change always the character and power of the knowledge.