Maitri Upanishad

मैत्र्युपनिषद्

A later Upanishad from the Maitrayani branch of the Krishna Yajurveda, in seven chapters. Introduces early Yoga and Samkhya concepts alongside Vedantic thought. Discusses the three states of consciousness, OM, Brahman as the inner fire (Vaishvanara), and the bondage and liberation of the individual soul.