四分律刪繁補闕行事鈔 3.389

3.389

且分大小二乘，略知途略。但相似道、相似善，難知難學，多墮邪林；理須通學，方堪正觀，不以誦語，而為道業。如《十住婆沙》及《十地》中說。又經云：以因多聞，得智惠故，便入佛法。不得頓學，猶如大海。

Provisionally distinguishing the Great and Small Vehicles in this way allows one to roughly know the outline of the paths. However, the path of resemblance and the wholesome of resemblance are hard to know and hard to learn, frequently leading to falling into the thicket of heterodoxy; one must study comprehensively before being capable of correct contemplation, not taking the mere recitation of words as the work of the path. As stated in the Daśabhūmika-vibhāṣā and the Daśabhūmika. Furthermore, a sūtra says: 'By means of much hearing, one attains wisdom and thus enters the Buddhadharma. It cannot be learned all at once, just like the great ocean.'