問訊者,知之本;念慮者,知之道也。
Inquiry is the basis of knowledge, and reflection is the path of knowledge.
此言貴因人知而加知之,不貴獨自用其知而知之。
In other words, one should prize reliance on others’ knowledge as a means of adding to one’s own knowledge; one should not prize dependence on one’s own knowledge alone as a means of gaining more knowledge.