佛說佛名經 30.87

30.87

"All of you together: at this very moment, our bodies and minds are tranquil, without flattery and without hindrance, which is precisely the time to generate good and eliminate evil. Furthermore, each of you should generate four kinds of contemplative practice to serve as preliminary skillful means for extinguishing offences. What are the four? First, contemplating causes and conditions; second, contemplating karmic retributions; third, contemplating one's own body; fourth, contemplating the body of the Tathāgata.