大乘起信論義記 3.421

3.421

In the remedies, bowing during the six periods, etc., generally clarifies the expedient means for eliminating obstacles. Just as a debtor who depends on a king cannot be touched by the creditor, so too a practitioner who bows to the Buddhas is protected by the Buddhas and can escape all obstacles. From 'repenting' onward, the four obstacles are eliminated separately: first, the obstacle of evil karma is eliminated through repentance; second, the obstacle of slandering the true Dharma is eliminated through supplication; third, the obstacle of envying the excellence of others is remedied through rejoicing; fourth, the obstacle of delighting in the three realms of existence is remedied through pariṇāmanā. Because these four obstacles can cause practitioners not to abandon practices and not to proceed toward bodhi, one cultivates these four practices to remedy them. Moreover, the first remedies karmic obstacles through observance by abstention; the latter three increase wholesome roots through observance by action.