大乘起信論裂網疏 6.111

6.111

此即法門無量誓願學也。不離顛倒分別，則不能親諸佛菩薩。不勤供養聽法，則不能修無量度生法門。是故四弘宛轉相成。

This is the vow to study measureless Dharma gates. Without departing from inverted discriminations, one cannot draw near to Buddhas and bodhisattvas. Without diligently making offerings and hearing the Dharma, one cannot cultivate the measureless Dharma gates for delivering sentient beings. Therefore, the four great vows mutually support and complete one another.