維摩經玄疏 2.127

2.127

次明對治助開三解脫門者，即是四禪、四無量心、四無色定、九想、八念、十想、八背捨、八勝處、十一切處、九次第定、事中六度等諸對治法，助開三脫門也。

Next, explaining the remedial aids to opening the three doors of liberation: these are the various remedial dharmas, such as the four dhyānas, the four immeasurables, the four formless absorptions, the nine contemplations of foulness, the eight recollections, the ten perceptions, the eight liberations, the eight stages of mastery, the ten totalities, the nine sequential absorptions, and the six perfections in practice, which aid in opening the three doors of liberation.