四明十義書 2.194

2.194

故《妙樂》釋事法觀後云云下引《止觀》文者，乃是令講授之者以廣決略也。何得難云：若不看《止觀》，何得自知三千妙境耶？若皆自看《止觀》便能修觀，何故具五緣中須近教授善知識耶？

Therefore, when the Miaole explains the contemplation of phenomenal teachings and, after the words 'and so forth', cites passages from the Zhiguan, it is intended to have the lecturer resolve the concise by means of the expanded. How can you object, saying: 'If one does not read the Zhiguan, how could one know the wonderful object of the three thousand [realms] by oneself?' If everyone reading the Zhiguan by themselves could thereby cultivate contemplation, why would 'drawing close to a good friend who instructs' be required among the five conditions?