The following is a quote from the Heart Sutra (also known as the Prajñāpāramitā-hṛdaya Sutra). The sutra is spoken by Avalokiteśvar, a Boddhisattva, and is addressed to his disciple, Sariputra.
‘Thus, Satiputra, all things have the character of emptiness, they have no beginning, no end, they are faultless and not faultless, they are not perfect and not imperfect. Therefore, O Sariputra, here in this emptiness there is no form, no perception, no name, no concepts, no knowledge. No eye, no ear, no nose, no tongue, no body, no mind. No form, no sound, no smell, no taste, no touch, no objects…There is no knowledge, no ignorance…there is no decay nor death; there are no four truths. There is no pain, no origin of pain, no stoppage of pain, and no path to the stoppage of pain. There is no knowledge of nirvana, no obtaining it, no not-obtaining it.’