The Tathagatas do not teach a Dharma that is dependent upon letters. Anyone who teaches a doctrine that is dependent upon letters and words is a mere prattler, because Truth is beyond letters and words and books. This does not mean that words and books never declare what is in conformity with meaning and truth, but it means that words and books are dependent upon discriminations, while meaning and truth are not; moreover, words and books are subject to the interpretation of individual minds, while meaning and truth are not.

(The Lankavatara Sutra)