* La paix et l'harmonie: This is the most literal translation and the most common way to express the concept.
* La paix et la concorde: This emphasizes agreement and unity.
* La paix et la tranquillité: This focuses on calmness and serenity.
* L'harmonie et la paix: This emphasizes the importance of harmony as a path to peace.
The best choice depends on the specific situation and the nuance you want to convey.