The Tiantai, or Tendai, sect founded by 智顗 Zhiyi. It bases its tenets on theLotus Sutra法華經 with the 智度論, 涅槃經, and 大品經; it maintains the identity of the Absolute and the world of phenomena, and attempts to unlock the secrets of all phenomena by means of meditation. It flourished during the Tang dynasty. Under the Sung, when the school was decadent, arose 四明 Ciming, under whom there came the division of 山家 Hill or Tiantai School and 山外 the School outside, the latter following 悟恩 Wuen and in time dying out; the former, a more profound school, adhered to Ciming; it was from this school that the Tiantai doctrine spread to Japan. The three principal works of the Tiantai founder are called 天台三部, i. e. 玄義 exposition of the deeper meaning of the Lotus; 文句 exposition of its text; and 止觀 meditation; the last was directive and practical; it was in the line of Bodhidharma, stressing the 'inner light'.