大通方廣懺悔滅罪莊嚴成佛經 2.18

2.18

"Good son, there are furthermore four dharmas by which one skillfully and fully understands [how to advance] from the first ground to the tenth ground. First, planting roots of goodness over a long period; second, being free from all faults; third, skillfully understanding expedients; fourth, diligently practicing vigorous effort, dedicating it to bodhi. These are named the four.