The Sutra of the Treasure Name states: “The nembutsu of Amida’s Primal Vow is not our practice, it is not our good; it is simply keeping the Name of the Buddha.” It is the Name that is good, the Name that is the practice. When we speak of practice, we mean doing good. The Primal Vow is clearly the Buddha’s promise. When we have understood this, we see that the Vow is not our good, nor is it our practice. Hence we speak of Other Power.
The Name fulfilled in the Primal Vow is the direct cause of our birth; in other words, it is our father. The radiant light of great compassion is the indirect cause of our birth; it is our mother.