Swami Sarvapriyananda teaches the Katha Upanishad, one of India's most revered texts which is also a part of the Vedas. It is a collection of philosophical poems representing a conversation between the sage Naciketa and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).
Vedanta Talks - Swami Sarvapriyananda