- Katha Upanishad: It is part of the Yajurveda, one of the four Vedas, the foundational scriptures of Hinduism. Focuses on the dialogue between Nachiketa, a young seeker, and Yama, the god of death, about the nature of the soul (Atman), life after death, and the ultimate truth.
- Chandogya Upanishad: Part of the Sama Veda, it explores meditation (Upasana), the significance of sound (Om), and the unity of the self (Atman) with the ultimate reality (Brahman).
- Aitareya Upanishad: Discusses the origin of the universe, the creation of beings, and the importance of the self (Atman).
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