Mandukya UpanishadThe Mandukya Upanishad is the shortest of the major Upanishads, yet one of the most philosophically significant in Advaita Vedanta. It analyzes the syllable Om and the four states of consciousness — waking, dream, deep sleep, and turiya, the transcendent reality underlying them all. Its concise teaching, especially when studied with Gaudapada’s Karika, has had an enormous influence on nondual Vedantic thought.Book link ↗