the yoga sutras of patanjali cover the intellectual plane from the average level of awareness to the enlarged dimension of super consciousness. according to patanjali, samadhi is the last aspect of the eight-fold path which leads to realisation of yoga which unites the mortal with the immortal and "prajñā" is the state of perfection, the one, total indivisible entity. the perfect "yogi" on attaining this supreme state becomes a total non-entity. patanjali states – तस्य वाचकः प्रणवः that the word which express him is om but mere repletion of om is insufficient, for one should also meditate upon its meaning for gaining knowledge of the atman and destruction of the obstacles to that knowledge on road to reaching "nirvichara samadhi" when the mind becomes pure and – ऋतम्भरा तत्र प्रज्ञा in that "samadhi", knowledge is said to be filled with truth which knowledge goes beyond inference and scriptures.