摩訶止觀 9.51

9.51

心住者，於俗諦得一心。大住者，於真諦得一心。不亂於緣者，雖見真、俗無量境界，而於心不謬也。具明其相，備如通明觀中廣說。

"Mental abiding" is attaining one-pointedness of mind in conventional truth. "Great abiding" is attaining one-pointedness of mind in ultimate truth. "Unperturbed regarding conditions" means that although one sees the immeasurable realms of ultimate and conventional, one's mind is without error. Fully explaining its characteristics is as set forth extensively in the contemplation of luminous penetration.