四明十義書 1.101

1.101

故修內觀時，先用圓解攬於萬法唯我內心，然後專於內心而觀諸法。若宜修外觀者，亦須先攬萬法唯一色等，然後專於一境而觀諸法。故觀內心則一切法趣心，若觀外色則一切法趣色，是則只一非內非外之三千，隨乎觀慧趣內趣外不同。

Therefore, when cultivating internal contemplation, one first uses the perfect understanding to gather the ten thousand dharmas as only my internal mind, and then focuses exclusively on the internal mind to contemplate all dharmas. If it is appropriate to cultivate external contemplation, one must also first gather the ten thousand dharmas as only a single form, etc., and then focus exclusively on a single object to contemplate all dharmas. Therefore, when contemplating the internal mind, all dharmas converge toward mind; if contemplating external form, all dharmas converge toward form. Thus there is only one three thousand that is neither internal nor external, which differs in converging internally or converging externally according to the contemplative wisdom.