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It has been said that one can achieve it.
Chapter 1: Renunciation and Engagement in Vows are two aspects; both of them together lead to the completeness of the vow. The vow of engaging in good deeds means one should first renounce opposing bad deeds, which is automatically achieved. And the vow of renouncing bad deeds means that engaging the mind, speech, and body in opposing good deeds is also automatically achieved. Thus, although at this place the visible renunciation is referred to as a vow, it is understood that it also includes engagement, meaning that a vow is not merely inactivity.
The renunciation of nighttime meals is well-known as a vow. So why is it not mentioned here in this sutra?
The renunciation of nighttime meals has been recognized for a long time as a separate vow, but in truth, it is not the fundamental vow. It is a necessary vow that arises from the fundamental vow. There are many other vows that can also be imagined; however, since we are only describing the fundamental vow here, only that is mentioned. Other secondary vows that arise from it are included in the broader description of the fundamental vow. The renunciation of nighttime meals is one of the many vows that arise from the vow of non-violence.
Because of the destruction of life due to not seeing in the dark and the various actions that arise from the use of lights, the renunciation of nighttime meals is considered a part of the vow of non-violence. However, here a question arises: What if there is no darkness and there is no occasion arising from the light?