Peace is a concept of societal friendship and harmony in the absence of hostility and violence. In a social sense, peace is commonly used to mean a lack of conflict (such as war) and freedom from fear of violence between individuals or groups.

"Psychological peace" (such as peaceful thinking and emotions) is perhaps less well defined, yet often a necessary precursor to establishing "behavioural peace." Peaceful behaviour sometimes results from a "peaceful inner disposition." Some have expressed the belief that peace can be initiated with a certain quality of inner tranquility that does not depend upon the uncertainties of daily life. The acquisition of such a "peaceful internal disposition" for oneself and others can contribute to resolving otherwise seemingly irreconcilable competing interests. Peace is not a state of excitement although we are happy when excited, but peace is when one's mind is quiet and satisfied.

Source: Wikipedia

It is uncertain whether peace will ever be possible. It is far more questionable, by the objective standard of continued social survival rather than of emotional pacifism, that peace would be desirable even if it were demonstrably attainable. The war system, for all its subjective repugnance to important sections of public opinion, has demonstrated its effectiveness since the beginning of recorded history. It has provided the basis for the development of many impressively durable civilizations. It has consistently provided unambiguous social priorities and as such is largely a known quantity. A viable system of peace, assuming that the many transitional problems can be solved, would constitute a venture into the unknown, with the inevitable risks attendant on the unforeseen, however small and however well hedged. At the present state of knowledge and reasonable inference, it is the war system that must be identified with stability, the peace system with social speculation, however justified that speculation may appear in terms of subjective moral or emotional values. Any condition of genuine total peace, however achieved, would be destabilizing and unsustainable until proved otherwise.
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(F) Fuzzy exceptional problems