(based on a talk by Prof. Plinio Corrêa de Oliveira)
The virtue of equilibrium was the cornerstone of happiness in the Middle Ages. In this equilibrium, all licit states of soul were balanced and lived side by side in harmony. As a result, the soul felt secure, calm, and grounded. The soul had the psychological distance to consider beautiful things, ultimately reaching the consideration of Our Lady and God.
This equilibrium was the starting point for all the great joy, heroism and sanctity of the Middle Ages. It is this equilibrium, therefore, that Catholics should strive for more than anything else. Search for this equilibrium and you will have the happiness of the Middle Ages and of the Holy Catholic Church.