四明十義書 1.112

1.112

故修外觀，如觀一塵，亦須先用妙解，了知內心及一切法同趣一塵，但於一塵觀一切法。

Therefore, when cultivating external contemplation, such as contemplating a single dust mote, one must also first use wondrous understanding to comprehend that the internal mind and all dharmas equally converge toward a single dust mote, and simply contemplate all dharmas upon a single dust mote.