無量壽經優婆提舍願生偈註 2.163

2.163

隨意自在者，言此五種功德力能生清淨佛土，出沒自在也。身業者，禮拜也。口業者，讚歎也。意業者，作願也。智業者，觀察也。方便智業者，迴向也。言此五種業和合，則是隨順往生淨土法門自在業成就。

'At will and with mastery' means that the power of these five kinds of merits can bring about birth in the pure Buddha-land, and appearing and disappearing with mastery. Bodily karma is worship. Vocal karma is praise. Mental karma is making aspirations. Karma of wisdom is contemplation. Karma of the wisdom of skillful means is dedication of merit. This means that when these five kinds of karma harmonize, it is the mastery of accomplishment of the karma that accords with the Dharma gate of rebirth in the Pure Land.