Mandukya Upanisad and Prasna Upanisad both belong to Atharvaveda. They keep important position as regards Jnana Kanda the knowledge portion of the Vedas. Mandukya, though it is the smallest Upanisad - it consists of only twelve short passages - it encompasses the entire range of human consciousness. It describes beautifully all the states of consciousness along with the discipline - Sadhana to raise our consciousness from the lowest to the highest, culminating in full attainment of the Self-Atman or Brahman. The main subject discussed in the Prasna Upanisad that of Prana (The Primal Energy) in the form of four questions. The fifth question is about Pranava. In it we get the indication about the Sadhana spiritual discipline to realise the ultimate Truth. The last question is about the Goal, about the Being whom we have to discover in ourselves.