It's easy to promote world peace, but the more difficult part is achieving that peace.
The key to ending violence in the world is not public policy, but first eliminating any hostility in our own hearts.
In a treatise on Christian Perfection by St Gregory of Nyssa, he relates this necessary part of establishing peace.
Peace, if it is to last, must be interior before it can become exterior.
Peace can start today, but we need to look at ourselves and our own wounded heart first.