Read this: Śīla is the foundation of Samādhi/Bhāvana (Meditative cultivation) or mind cultivation. Keeping the precepts promotes not only the peace of mind of the cultivator, which is internal, but also peace in the community, which is external. According to the Law of Karma, keeping the precepts is meritorious and it acts as causes that would bring about peaceful and happy effects. Keeping these precepts keeps the cultivator from rebirth in the four woeful realms of existence.

What promotes not only the peace of mind but also peace in the community?
What is the answer? (If it cannot be answered, return "unanswerable")
keeping the precepts