九川问曰：「伊川说到体用一原、显微无间处，门人已说是泄天机，先生『致知』之说，莫亦泄天机太甚否？」
先生曰：「圣人已指以示人，只为后人揜匿，我发明耳，何故说泄？此是人人自有的，觉来甚不打紧一般。然与不用实功人说，亦甚轻忽可惜，彼此无益；与实用功而不得其要者提撕之，甚沛然得力。」
九川问：「程颐讲到体用一原、显微无间处，门人已说是泄露天机；先生『致知』之说，莫不是泄天机太过了吗？」
先生说：「圣人早已指给人看，只是后人掩藏起来，我不过重新发明，怎么说泄？这是人人自有的，觉来却好像不打紧一般。然而与不用实功的人讲，也甚可惜，彼此无益；与实下功夫而不得要领的人点拨，便甚沛然得力。」
I asked: 'When Cheng Yi reached substance and function one source, the manifest and subtle without seam, his disciples already cried betrayal of heaven's secret. Does your doctrine of extension not betray it too far?'
The Master said: 'The sages long since pointed it out to men; later hands only buried it — I but uncover it again: what betrayal? It is every man's own; wakened, it seems to count for nothing. Told to those who do no real work, alas the pity — gain for neither; pointed out to those who truly work yet miss the key, it floods in with strength.'