Pacem in Terris §165

¹⁶⁵ The world will never be the dwellingplace of peace, till peace has found a home in the heart of each and every man, till every man preserves in himself the order ordained by God to be preserved. That is why St. Augustine asks the question: "Does your mind desire the strength to gain the mastery over your passions? Let it submit to a greater power, and it will conquer all beneath it. And peace will be in you—true, sure, most ordered peace. What is that order? God as ruler of the mind; the mind as ruler of the body. Nothing could be more orderly." (69)