Peace is something of a complex concept. The word itself brings up several aspects, whether world peace, peace of mind, calmness, but I would like to speak on a uniform concept of peace. A peace which touches on each of these aspects and is the transcendent concept of it.
I think it is worthwhile to speak quickly on the nature of world peace though. Not to argue for or against, but the concept of peace from war. Often the case in this point is that peace is a resistance to war. That there is some element which keeps us from declaring war, despite the want from atleast one “side” to declare such. This I see as significantly different from peace when both sides would not declare war.
More generally, resistance against a concept is significantly different from simply no interest or not adopting the stand-point. While this seems obvious to the distinction and the individuals holding it, many people believe the resultant effects are quite the same. However, the difference is similar to how the “cold war” was not a war. The resistance or tension itself has effects on decisions, relations, interactions, and subtle acts with one another. Also, the efficacy of this resistance lasts only so long as no one erodes the reason, whether it be fear, hope, hatred, or love. This too creates a weakness in the inherent concept. The strength however lies in the fact that there is a solid aspect which can be strengthened as well, to create a greater resistance.
Ultimately however, this resistance relies on both perspective and individuals allowing themselves to be subjected to such issues. All it takes to remove the resistance is a change in perspective, overcoming the negative or positive emotion holding the individual at bay, and all this can change. It is both an obvious target, a power to wield, and incredibly fragile in the hands of any individual due to its reliance on their belief in the resistance.
Peace, as with other subtle concepts like happiness and freedom are strongest when they are inherent as they truly are. True piece [as I will begin referring to peace for peace, and applied peace as peace from resistance], comes from not being conflicted. It is the removal of the obstacles that prevent us from acting. While before I used peace as an opposite to war, it is not my belief that one at war can not be at peace, merely that it is unlikely in our societies at this time. Peace is the sense of right and lack of conflict, it is what is left when you are no longer at odds with the world, neighbors, strangers, friends, or your self. It is not so much a particular act, as the potential for acting and being. War, is an action, conflict, is an act, fear is a feeling, but peace is the lack thereof, and acts as a sort of power-vaccum enabling us to act as compelled.
I regard happiness on a similar vein. It is something I have spent my life trying to share with people, and hold in high regards, in a large way because of its effect on my self, utility, and because of how much our society and individuals strive for it. Happiness though, as i see it comes from 2 aspects. First and most common in the American society is distraction, entertainment, beauty, and the like. These all are enwrapped in this enveloping aspect which involves humor, general aesthetics, puzzling, or other aspects which might take you away from your concerns, override your current conflicts, or generally please you with an energetic, often giddy feeling. While I like this aspect, I feel it is often quite common and easy to come by these days. The other aspect I feel tends to be more moving, subtle, conceptual, releasing. Overcoming an issue which has been bothering you bear an aspect of both entertainment (the part of celebration), and release, in being allowing yourself to not be disturbed by such issues, and relieving ones self of the burden. This form of happiness is harder to come by as it is not something easily objectified, and is bound upon releasing aspects and being free, as opposed to acquiring or subsumed.
The subtle happiness though is inherent, it is there when you have removed the things which make you unhappy. Unhappiness is an object, a resistance, an issue, happiness is inherent, much like the peace above, or the concept of freedom. It is what you have when not pressed upon, when being true to your self and life.
The problem in approaching this concept of release is that there is nothing to force against, to create, to actively make. You have to trust the release, that in the end when all other forces are removed, you are yourself, that peace, happiness, freedom are what you have when you are not caught under duress. It is difficult to believe that releasing something you feel makes you happy can make you happier, or that by not worrying about an issue you will be able to think more clearly about it, and handle it with greater ease. However, it is where we have come from, it prevents us from burning up our mind, self, body, and feelings on upkeep and lets us handle life as it appears to us, understanding trends and the moment. Where the weakness to this happiness lays, is where the strength of the entertainment happiness begins. Interestingly, as Kant put, subtlety is lost without beauty to garner attention to it, and beauty is lost without the meaning and moving effects of the subtle feelings.