WASHINGTON — Archbishop Wilton Gregory expressed “deep gratitude and immeasurable joy” as he took charge of the nation’s capital see see Tuesday.

“I want to be a welcoming shepherd who laughs with you whenever we can, who cries with you whenever we must, and who honestly confesses his faults and failings before you when I commit them, not when they are revealed,” Archbishop Gregory said to applause during his May 21 installation Mass as archbishop of Washington in Washington’s Basilica of the National Shrine of the Immaculate Conception.

“We stand at a defining moment for this local faith community,” he said.

“Our recent sorrow and shame do not define us; rather, they serve to chasten and strengthen us to face tomorrow with spirits undeterred.”

Calling his installation as the seventh archbishop of Washington an “indescribably humbling moment,” Archbishop Gregory pledged himself to a new era of openness in Washington.

The archbishop’s installation Mass was presided over by apostolic nuncio Archbishop Christoph Pierre and attended by eight cardinals, more than 50 bishops, some 300 priests, and nearly 100 deacons.

U.S. bishops’ conference president Cardinal Daniel DiNardo of Galveston-Houston, reportedly still recovering from a March stroke, was not in attendance.

The celebration was held at the national shrine instead of Washington’s St. Matthew’s Cathedral in order to accommodate the crowds, numbering about 3,000 worshippers.

Members of the faithful from around the archdiocese gathered outside the basilica waving flags and banners of welcome and singing before the Mass began.

A Gospel choir led the music during the Mass.

Acknowledging the scandals that have rocked the Church, both in Washington and around the world, Archbishop Gregory said, “We have been tossed about by an unusually turbulent moment in our own faith journeys recently and for far too long.”

“We clerics and hierarchs have irrefutably been the source of the current tempest.”

Recalling the image of the apostles’ fear on stormy seas, he told the assembly that true peace is found by remembering that Christ was in the apostles’ boat.

“He invites us to place our trust in him — not in trite and easy programs, but in him and him alone.”

Despite the pressure of recent scandals, Archbishop Gregory said he had already received an “affectionate and embarrassingly gracious welcome.”

“The example I wish to set forth for you is that of a man filled with the faith, hope and joy of knowing Jesus Christ is in the boat.”

He thanked Pope Francis for the “righteous challenge — more an opportunity” to carry the Gospel message to the poor, the marginalized and the neglected.

“Beginning today, that is my take here in the Archdiocese of Washington.”

Archbishop Gregory’s appointment was first reported on May 28, and his installation has been eagerly anticipated. Technically, Washington has been without an archbishop since Cardinal Donald Wuerl’s resignation was accepted by the Pope in October last year, though Cardinal Wuerl himself has served as interim leader of the archdiocese since that time.

Archbishop Gregory paid tribute to his predecessor during the homily, calling Cardinal Wuerl a “cherished friend” and, “above all, a true Christian gentleman.”

The archbishop of Washington is generally viewed as one of the most influential Churchmen in the United States; the five most recent archbishops were all created cardinals — including the now-laicized Theodore McCarrick. While Archbishop Gregory, 71, is widely expected to be named a cardinal in the future, it is usual for the Pope to wait until the previous cardinal-archbishop from the same diocese turns 80 years old and becomes ineligible to vote in a conclave. Cardinal Wuerl will turn 79 in November.

As a former president of the U.S. Conference of Catholic Bishops from 2001 to 2004, Archbishop Gregory was responsible for helping to lead the American hierarchy through the fallout of the Church’s 2002 sexual-abuse scandals. He oversaw the formation and implementation of the “Dallas Charter” and USCCB’s “Essential Norms” in 2002.

His appointment is also historic because he is the first African American to be appointed archbishop of Washington; the city itself is more than 50% African American. Archbishop Gregory is also the first convert to Catholicism to be appointed archbishop of Washington.