Savitri Upanishad

It is attached to the Samaveda, and one of the Samanya Upanishads. The text title is related to the Hindu Sun god. The Upanishad describes the Savitri-vidya (knowledge of sunlight), asserting that everything in the universe is a manifestation of the masculine Savitr and feminine Savitri, elaborating on the Gayatri Mantra. The text also presents the Advaitic notion of nondual Brahman, as well as two mantras called the Bala (Strength) and Atibala (Super Strength) to meditate on Virat Purusha and Om. The text opens with two questions, "who is the Savitr? what is the Savitri?" Thereafter, it answers these question first with examples, wherein nine masculine-feminine pairs exemplify the nature of Savitr-Savitri.