What is Brahman?

From the Upanishads:

What cannot be seen with the eye, but that whereby the eye can see; Know that alone to be Brahman, the Spirit, and not what people here adore.

What cannot be heard with the ear, but that whereby the ear can hear; Know that alone to be Brahman, the Spirit, and not what people here adore.

What cannot be thought with the mind, but that whereby the mind can think; Know that alone to be Brahman, the Spirit, and not what people here adore.

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