Chih-i illustrates the five meanings of sūtra (in the view concerning the word sūtra as translatable) with reference to the mind contemplation. Each of these five meanings is also scrutinized by Chih-i in terms of words, practice and principle. This is because all speeches and words are caused by mental function; all practices are caused by the mind of thinking; and all doctrines and principles are derived from the mind of wisdom. (Vol. 2, Page 398)