阿彌陀經疏 1.74

1.74

舍利弗下，二、結不虛。是為甚難者，五濁界中行難行之行而得菩提其事已難，復說此難信之法，二事兼作，是甚難也。諸佛讚我，豈虛言哉？

From “Śāriputra” onward, [part] two: concluding that it is not in vain. “This is extremely difficult”: practicing difficult practices in the realm of the five defilements and attaining bodhi was already a difficult matter, and furthermore expounding this Dharma difficult to believe—doing both matters together is what is extremely difficult. How could the buddhas' praise of me be in vain?