雜阿含經 259.p8

259.p8

Śāriputra replied, “Kauṣṭhila, someone who wants to realize the fruit of once-returning after realizing the fruit of stream entry should also diligently contemplate this, ‘The five acquired aggregates are like illnesses, abscesses, thorns, and killers. They are impermanent, painful, empty, and not self.’ Why is that? Because it’s appropriate for his situation. If a monk diligently contemplates these five acquired aggregates, he’ll realize the fruit of once-returning.”