法華義疏 9.68

9.68

繫珠者，本說大乘之旨不令暫受而已，乃為染神歷劫不朽，故借醉不覺知時以明繫珠耳，實非是不覺知時繫。二者、夫解之珠喻菩提心，不失正在後時，今欲顯後時不朽之解由於佛授，故在後時說耳。又所以知繫寶珠非是不覺知時者，珠喻菩提心，若都不覺知，云何發菩提心也。但今據後時廢忘，故云不覺知耳。

Regarding the tying of the jewel: the original purpose in expounding the intent of the Mahāyāna was not to have it received merely temporarily, but to perfume the consciousness so that it would not perish across kalpas. Therefore, [the text] merely borrows the time of drunken unawareness to illustrate the tying of the jewel; in reality, it was not tied at a time of unawareness. Second, the jewel of understanding represents the bodhicitta; that it was not lost comes to light precisely at a later time. Now, wishing to show that this imperishable understanding of a later time derives from the Buddha's conferral, it was spoken of with reference to the later time. Moreover, how we know that the tying of the precious jewel did not occur at a time of unawareness is that the jewel represents the bodhicitta: if he were completely unaware, how could he have given rise to the bodhicitta? It is only based on his later neglect and forgetting that it says he was "unaware."