The Upanisads, literally meaning “to sit near someone,” constitute the concluding portion of the Vedas, the first original Hindu scripture, which has four sections: Samhitās or collections—hymns, prayers, and formulas of sacrifice; Brāhmanas—prose treatises discussing the significance of sacrificial rites and ceremonies; Āranyakas, or forest texts; and the Upanisads, or later Vedas. The Upanisads are the main basis for the Vedānta school of philosophy. The doctrines of the Upanisads were imparted orally. Groups of students sat near the teacher to learn from him the truths by which ignorance could be destroyed. The authors of the Upanisads, of which there are more than two hundred are not known. The principal Upanisads are the Ísa, Kena, Katha, Praśna, Mundaka, Māndūkya, Taittirīya, Aitareya, Chāndogya, and Brhadāranyaka Upanisads. Śankara, the Vedānta philosopher, wrote commentaries on the above ten and on the Śvetāśvatara Upanisads. In addition, the Kausitaki, Mahānārāyana and the Maitri are also considered principal Upanisads. These Upanisads were written partly in prose and partly in verse.
The Upanisads are concerned with the meaning of the sacrificial rites, and in the process of discussing them, they introduce some profound metaphysical and religious ideas. With the Upanisads began the period of speculative...
(The entire section is 461 words.)