起信論疏筆削記 18.32

18.32

若有眾生來求法者，即受施人，三乘五乘、或請或問，皆名求法。隨已下，所施法。不能不解者，輒不與言，於能解處即與說之，方免誤人，亦免尤難。孔子曰：「知之為知之，不知為不知，是知也。」又云：「多聞闕疑，慎言其餘，則寡尤。」方便說者，要以種種言辯巧便引勸，使其信受，不得直置令其誹謗，故《法華》云：有問難不瞋，隨順為解說。

"If there are sentient beings who come seeking the Dharma" refers to the recipients of giving: whether of the three vehicles or five vehicles, requesting or asking, all are called seeking the Dharma. "According to one's own..." below refers to the Dharma given. What one is not able to understand, one does not speak of lightly; where one can understand, one explains it to them. Only then does one avoid misleading others and avoid blame and hardship. Confucius said: "To know when you know, and to know when you do not know—this is knowledge." He also said: "Hear much, set aside what is doubtful, and speak cautiously about the rest; then you will have few regrets." "Expounding through skillful means" means that one must use various eloquence and skillful means to guide and encourage them, causing them to have faith and accept it; one must not speak straightforwardly so as to cause them to slander it. Therefore the Lotus Sūtra says: When questioned with difficulties, do not be angry, / but explain in accordance [with their capacity].