雜阿含經 404.p6

404.p6

“The correct teaching that I know but don’t teach is like the leaves of this great forest and like my achievement of complete awakening. Why is that? Those teachings are not beneficial to the aim, not beneficial to the teaching, not beneficial to the religious life, nor to insight, wisdom, correct awakening, and the correct way to Nirvāṇa. Therefore, monks, those who have yet to directly realize the four noble truths should apply themselves to the method, arouse increasing motivation, and train for that direct realization.”