觀無量壽佛經疏 2.40

2.40

問曰：「八戒既言勝者，一受即足。何須日日受之？」答曰：「山不厭高，海不厭深，刀不厭利，日不厭明，人不厭善，罪不厭除，賢不厭德，佛不厭聖。然王意者，既被囚禁，更不蒙進止。念念之中，畏人喚殺。為此晝夜傾心，仰憑八戒，望欲積善增高，擬資來業。」

Question: 'Since the eight precepts are said to be superior, receiving them once is sufficient. Why was it necessary to receive them day after day?' Answer: 'Mountains do not weary of height; the sea does not weary of depth; knives do not weary of sharpness; the sun does not weary of brightness; humans do not weary of goodness; sins do not weary of being eliminated; the worthy do not weary of virtue; Buddhas do not weary of sanctity. The king's intention was that, having been imprisoned, he received no further edicts. Thought after thought, he feared that someone would summon and kill him. For this reason, day and night he poured out his mind and looked up in reliance on the eight precepts, wishing to accumulate good and increase height to provide for future karma.'