“Our hearts are restless until they rest in you.” St. Augustine’s famous words addressed to God introduce his account of how a headstrong, self-indulgent young man became one of the most important Christian thinkers of all time and a saint — and the father of the Augustinian order, to which Pope Leo XIV belongs.

The first American pope has spoken in the past with affection about the fifth-century convert, bishop and intellectual powerhouse considered the father of his religious order, the Order of St. Augustine.

Days before he was elected, Pope Leo XIV (then Cardinal Robert F. Prevost) received a ringing endorsement from a Catholic school teacher in New Jersey — one the pope-to-be apparently read just hours before entering the conclave at which he would be chosen.

Ecumenical Patriarch Bartholomew of Constantinople said he hopes Pope Leo XIV will “be a dear brother and collaborator … for the rapprochement of our churches, for the unity of the whole Christian family, and for the benefit of all of humankind.”

Pope Leo XIV’s schedule of public liturgies in May includes events revolving around the inauguration of his ministry, visits to Rome’s major basilicas and a celebration of priestly ordinations.

Pope Leo XIV’s devotion to St. Augustine, his life and ministry as a member of the Augustinian order and his focus on the unity of the church are reflected in his episcopal motto and coat of arms.

Peruvians have greeted the election of Pope Leo with elation, pride and even disbelief that an adopted prelate whose pastoral formation came as a Augustinian missionary in poor and undeveloped parts of Peru could become pope and represent the country on the world stage.

Ukrainian President Volodymyr Zelenskyy thanked Pope Leo XIV for his support of a just and lasting peace in Ukraine, and he invited the newly-elected pontiff to visit the war-torn nation.

It is a reminder, as always, that when it comes to scoring papabile, usually those who know don’t say, and those who say don’t know.

Aside from Leo XIII, himself not canonized, there have been 12 others who share a name with the new pope, and five of those predecessors attained the heights of sanctity and have been proclaimed saints.