四明十義書 1.40

1.40

又上人堅云：若事法觀以陰為境，即同止觀約行之觀，何名託事附法觀者。

Furthermore, the Venerable firmly insists: 'If the contemplation of phenomena and teachings takes the aggregates as the object, it would then be identical to the contemplation in terms of practice in Zhiguan; why would it be called the contemplation of entrusting to phenomena and appending to teachings?'