弘明集 2.10

2.10

或問曰。孔氏之訓無求生以害仁。又殺身以成仁。仁之至也。亦佛經說菩薩之行矣。老子明無為之至也。即泥洹之極矣而曾不稱其神通成佛。豈孔老有所不盡與明道欲以扇物而掩其致道之實乎。無實之疑安得不生。

Someone asked: "The instruction of Confucius says, 'Do not seek life so as to harm humaneness,' and also, 'Sacrifice the body to achieve humaneness.' This is the utmost of humaneness, and it is also what the Buddhist scriptures call the practice of a bodhisattva. Laozi made clear the ultimate of non-action, which is the acme of Nirvāṇa. Yet neither ever spoke of spiritual powers or becoming a Buddha. Was it that Confucius and Laozi did not exhaustively know it, or did they, wishing to sway beings with their clear Dao, conceal the reality of attaining the Dao? How could doubts about its lack of reality not arise?"