The 108 Upanishads

"The Upanishads teach us all there is of religion."
"The Upanishads do not reveal the life of any teacher, but simply teach principles."
"Vedas, are divided into two portions — the Karma Kânda and the Jnâna Kânda."
"The Karma Kanda includes various sacrifices and ceremonials, of which the larger part has fallen into disuse in the present age."
"The Jnana Kanda, as embodying the spiritual teachings of the Vedas known as the Upanishads and the Vedanta, has always been cited as the highest authority."
"The meaning of the word 'Veda', from which the word 'Vedanta' comes, is knowledge."
"By Vedanta is always meant the Upanishads — know that this is the only religion that does not cling to any person."
"The mass of knowledge called the Vedanta was discovered by personages called Rishis, and the Rishi is defined as a Mantra-drashtâ, a seer of thought; not that the thought was his own."
"The word Mantra means "thought out", cogitated by the mind; and the Rishi is the seer of these thoughts."
"Rishis are discoverers of spiritual laws."
"Truth came to the Rishis of India — the Mantra-drashtâs, the seers of thought — and will come to all Rishis in the future, not to talkers, not to book-swallowers, not to scholars, not to philologists, but to seers of thought."
—  Swami Vivekananda(Indian Hindu monk)

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"Theproduction of the highest human wisdom."

"The most profitable and elevating reading which is possible in the world."
"It has been the solace of my life, and will be the solace of my death."
—  Arthur Schopenhauer(German Philosopher on Upanishads;predicted that the philosophy and knowledge of the Upanishads would become the cherished faith of the West)