On Sept. 10, 1919, Gen. John J. Pershing led his returning troops up Fifth Avenue before crowds numbering 2 million. In front of St. Patrick's Cathedral, he dismounted from his rambunctious white horse "Captain" to greet Cdl. Désiré-Joseph Mercier, who had arrived in New York by ship the night before. The general made a point of expressing his esteem for the Belgian prelate. Perhaps the name Mercier means little to many today, but over the course of several weeks, he received an unprecedented series of welcomes in the United States, excelling even the welcome tour of Lafayette in 1824–1825.
Cardinal Mercier had become a hero to the world for his defense of Belgium during its sufferings after the German invasion. It is edifying to read on the internet the account of the celebrations in America recorded by Fr. Thomas C. Brennan. In it, he describes the prelate addressing Protestant leaders in English, rabbis in Hebrew and academics in a Latin more fluent than their own, as they bestowed honorary laurels upon him.
This archbishop led a revival in studies of Thomas Aquinas, but more than that, he was an image of moral integrity, a cardinal honored more for himself than for his title. The response to the Donatist heresy established with certainty, through the articulation of such as St. Augustine, that the personal attributes of a cleric do not affect the legitimacy of his priestly acts; the sacraments of a weak bishop can confer the same grace as those of a saint. But the moral integrity of a cleric empowers his encouragement of souls. Weak leaders and their bromide-churning bureaucracies have scant moral influence.
Cardinal Mercier had a zeal that issued from a love of doctrinal truth. In the wartime chaos of 1917, he told his priests not to tell their people to love if they could not explain the theology that justifies love.
He gave a practical formula for happiness:
"Every day for five minutes control your imagination and close your eyes to the things of sense and your ears to all the noises of the world, in order to enter into yourself. Then, in the sanctity of your baptized soul (which is the temple of the Holy Spirit), speak to that Divine Spirit, saying to Him:
O Holy Spirit, beloved of my soul, I adore You. Enlighten me, guide me, strengthen me, console me. Tell me what I should do. Give me your orders. I promise to submit myself to all that You desire of me and accept all that You permit to happen to me. Let me only know Your Will.
If you do this, your life will flow along happily, serenely and full of consolation, even in the midst of trials. Grace will be proportioned to the trial, giving you strength to carry it, and you will arrive at the gate of paradise laden with merit."