四明十義書 1.113

1.113

故《四念處》云：觀外十界即見內心。是則趣觀外之一塵既具十界，豈不攝乎內心？故云即見內心。何得却謂此文是攝外歸內耶？須知此文是內心趣外之義也。

Therefore the Sinianchu says: 'Contemplating the external ten realms, one sees the internal mind.' Thus, since the single dust mote outside upon which one converges in contemplation possesses the ten realms, does it not subsume the internal mind? Therefore it says: 'one sees the internal mind.' How could you conversely claim that this text means subsuming the external back into the internal? One must know that this text has the meaning of the internal mind converging outward.