首楞嚴義疏注經 7.13

7.13

持戒不完，五緣即闕，況為師範展轉授人，己戒不淨，他戒安就？故須選擇第一清淨真授戒者。故《梵網經》「千里內無授戒師，當於佛前自誓受戒。先懺七逆，後求戒法，皆見好相方知罪滅得戒，不爾不得。」戒既成就，閑居靜處，然香誦呪數滿百八，以表除滅百八煩惱。內戒外呪俾魔不生，恐障壇場，故須先爾求現住佛光照顯加，心得勇猛，進道彌速。

If the observance of precepts is incomplete, the five conditions are lacking; how much more when serving as a teacher and model transmitting them to others—if one's own precepts are not pure, how could another's precepts be accomplished? Therefore, one must select the foremost pure one who truly confers the precepts. Hence the Brahmajāla Sūtra says: 'If there is no master who confers precepts within a thousand li, one should take the precepts by self-vow before the Buddha. First repent of the seven rebellious offenses, and subsequently seek the precept dharma; only when one sees an auspicious sign does one know that the sins are eliminated and the precepts obtained; otherwise, one does not obtain them.' Once the precepts are accomplished, dwelling quietly in a secluded place, burning incense and reciting the mantra to the full number of one hundred and eight signifies the eradication of the one hundred and eight afflictions. Inner precepts and outer mantra prevent demons from arising. Fearing obstacles to the altar platform, one must first pray to the currently dwelling Buddhas for the manifest empowerment of their light, so that the mind becomes valiant and advancement on the Path becomes ever faster.