By enlarging one's mind, one can enter into all the things in the world [to examine and understand their principle]. As long as anything is not yet entered into, there is still something outside the mind. The mind of ordinary people is limited to the narrowness of what is seen and what is heard. The sage, however, fully develops his nature and does not allow what is seen or heard to fetter his mind. He regards everything in the world to be his own self. This is why Mencius said that if one exerts his mind to the utmost, he can know nature and Heaven. (1) Heaven is so vast that there is nothing outside of it. Therefore the mind that leaves something outside is not capable of uniting itself with the mind of Heaven. Knowledge coming from seeing and hearing is knowledge obtained through contact with things. It is not knowledge obtained through one's moral nature. Knowledge obtained through one's moral nature does not originate from seeing or hearing.

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