Adhyatma Upanishad

Adhyatma Upanishad The mind is His body. (Though) moving within the mind, the mind knows Him not. The mind-stuff is His body. (Though) moving within the mind-stuff, the mind-stuff knows Him not. The mind of the Yogin perishes as he stays without intermission in the Self alone, knowing, through reasoning, Shruti, and experience, that one is the Self of all beings. This perception of difference is rooted in the mind (of the percipient); there is none of it in the absence of the mind. Therefore, concentrate the mind on the supreme Self as the subject. The expressed sense of the word 'Tvam' shines forth as the content of the idea and expression 'I'; it is awareness blended with the mind (the inner organ of perception). 'Meditation' is indeed the exclusive attention of the mind fixed on (the import) rendered indubitable through listening and thinking. 'Concentration' is said to be the mind which, outgrowing the dualism between the meditator and meditation, gradually dwells exclusively on the object (of meditation) and is like a flame in a windless spot Mind's modifications in regard to the Self are un-cognized in that state; they are (only) inferred as past, after quitting the state of Samadhi.