大方廣圓覺修多羅了義經略疏 2.405

2.405

然眾生根性利鈍不同，煩惱厚薄、沈掉不等，隨其根性設教多端，不爾難為趣入。故《楞伽》云：「所說非所應，於彼為非說。彼彼諸病人，良醫為處方，如來為眾生，隨心應量說。」

However, sentient beings' capacities differ in sharpness and dullness, their afflictions vary in thickness and thinness, and their sinking and agitation are unequal; teaching is set forth in many ways according to their capacities—otherwise it would be difficult to gain entry. Thus the Laṅkāvatāra says: 'What is spoken not according to what is appropriate is non-speech to them. For various sick persons, a skilled physician prescribes medicine; the Tathāgata, for sentient beings, speaks in accordance with their minds and measures.'