佛說處處經 1.27

1.27

"When the Buddha expounds on the suffering and toil of birth and death and the affairs of the three evil destinies, there are wise people whose minds understand and immediately take [the stage of] arhat; although becoming arhats, they are the most venerable among them. Why is this? Because in past lives they practiced the bodhisattva path for five hundred kalpas, and having a compassionate mind they wished to deliver the people of the ten directions; therefore, although attaining the wisdom of an arhat, they can understand regional and vernacular dialects. When first becoming an arhat, one cannot spontaneously realize that in past lives he was a bodhisattva; the Buddha then expounds the Buddha's virtues, and further expounds the arhat's virtues for him; only then does he realize the Buddha's virtues are vast, and he regrets [his choice] and wishes to turn his mind to attain Buddhahood."