Advaita Vedanta shows that one indubitable certain existence, which is you, is actually this limitless existence called Brahman. "I exist surely, but I am a limited person," he says of his 'problematic' life. He adds: My successes in my life are limited by failures in life. It would be terrible to have unlimited failures"
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 Naciketas and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).