"If you look, you will find that I have never quoted anything but the Upanishads. And of the Upanishads, it is only that One idea, strength." Swami Vivekananda.All four volumes of The Upanishads as translated by Swami Nikhilananda.Volume 1 contains the Katha, Isa, Kena, and Mundaka Upanishads. Also contains an introduction with a general outline of the metaphysics and philosophy of Hinduism. Volume 2 contains the Svetasvatara, Prasna, and Mandukya Upanishads. Also contains an introduction with a general outline of the ethics of Hinduism.Volume 3 contains the Aitareya and Brihadaranyaka Upanishads. Also contains information on the value of rituals and symbols for the contemplation of God.Volume 4 contains the Taittiriya and Chhandogya Upanishads. Contains introductions to the two Upanishads describing rituals and contemplative worship as steps leading to the knowledge of God.