The five vital airs,Prana,Apana, Vyana, Udana and Samana are the constituents of Nada (the primordial sound). Bindu represents steadiness of our body, mind and intellect. Kala represents the Atma. The Ishavasya Upanishad deals with different aspects of Nada, Bindu and Kala. It says that these like a triangle with Self as the apex and the body and the mind as the two points at the base. The body is the gross, while the Self is subtle and the mind is a combination of the two. Just as Nada, Bindu and Kala are everywhere, the mind is also all pervasive as stated in Ishavasya Upanishad. The mind is the cause of pain and pleasure, happiness and misery, bondage and liberation. It should be properly directed towards Prajna (Awareness). The body is inert matter and cannot function without Prajna principle, which is radiation. Prana (vibration) animates the whole body. All the three are constituents of Sat-cit-ananda. Man experiences ananda in the deep sleep state, Swapna Avastha and perceives worldly things in the walking state, Jagrat Avastha. (SSS Vol.26, pp. 366-367)