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In page Peace:

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On a personal level, peaceful behaviours are kind, considerate, respectful, just, and tolerant of others' beliefs and behaviors. This understanding of peace can also pertain to an individual's introspective sense or concept of themselves, as in being "at peace" in one's own mind, as found in European references from c. 1200. The early English term is also used in the sense of "quiet", reflecting calm, serene, and meditative approaches to family or group relationships that have an absence of quarreling, disturbances and agitation.[citation needed]