十不二門指要鈔 1.54

1.54

初、雙標。總在一念者，若論諸法互攝，隨舉一法皆得為總，即三無差別也。今為易成觀故，故指一念心法為總。然此總別不可分對理事，應知理具三千、事用三千各有總別，此兩相即方稱妙境。

First, indicating both together. That the general resides in a single thought-moment means: if we speak of the mutual subsumption of all dharmas, whichever single dharma is brought up can serve as the general, which is the non-differentiation of the three. Now, in order to make contemplation easy to accomplish, we specially point to the mental dharma of a single thought-moment as the general. However, this general and specific cannot be separately paired with principle and phenomena; one should know that the three thousand realms inherent in principle and the three thousand realms functioning in phenomena each have their own general and specific; only when these two are identical to each other can it be termed a wondrous realm.