大乘起信論義記 3.342

3.342

第四門中釋相內，盡未來等者，長時心也。度一切眾生使無餘者，廣大心也。令得無餘涅槃者，第一心也。修意中二：初、顯順性；二、「法性廣大」下，明起大願意，亦即常心也。

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.