入楞伽心玄義 1.45

1.45

六、辨行者，謂真理性融掩絕圖度，聖智玄悟妙證相應，故云入難入也。此則以智入理也。

Sixth, concerning distinguishing practice, the principle of true reality is interfused, completely cutting off calculation and conjecture; the noble wisdom profoundly awakens and wondrously realizes in accord with it. Hence it is said to enter the difficult to enter. This means entering principle by means of wisdom.