大乘起信論義記 3.342

3.342

Within the explanation of characteristics in the fourth gate: “exhausting the future,” and so forth, is the long-lasting mind; “delivering all sentient beings so that none remain” is the vast mind; “bringing them to attain nirvāṇa without remainder” is the supreme mind. In the purpose of cultivation there are two parts: first, revealing conformity to the nature; second, from “dharmatā is vast and great” onward, clarifying the purpose of generating the great vow, which is also the constant mind.