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Pope Leo Says Council of Nicaea Still Has Role to Play for Christian Unity

Pope Leo XIV urges Christians to renew the Nicene Creed's profession of faith, highlighting its ecumenical role in unity and peace, marking 1,700 years since the Council of Nicaea.

  • On Sunday, Pope Leo XIV issued the Apostolic Letter `In Unitate Fidei` ahead of his Apostolic Journey to Türkiye for the 1700th anniversary of the First Council of Nicaea.
  • The First Council of Nicaea, convened in 325 by Emperor Constantine I, contested the Arian heresy and affirmed Christ's divinity, producing the Nicene Creed to unify doctrine.
  • The Apostolic Letter `In Unitate Fidei` is structured in twelve points to encourage faith renewal, with Pope Leo XIV underlining the Nicene-Constantinopolitan Creed's central role in Sunday worship.
  • Facing persistent divisions, the letter calls for renewed ecumenical dialogue, recognising other Churches and ecclesial communities as brothers and sisters, and invites prayer to the Holy Spirit to revive faith, hope and charity.
  • Lingering theological disputes mean some groups still reject the Creed, including restoration and Unitarian churches, while the `filioque` remains a subject of Orthodox-Catholic dialogue and Saint John Paul II promoted this message thirty years ago.
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Awaiting the Pope's visit to Turkey, Archbishop Antuan Ilgıt, the first autochthonous leader of the Apostolic Vicariate of Anatolia, speaks: "I feel close to young people for my life experience," he says: "Our Church? is a seed for the world."

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Vatican News broke the news in on Sunday, November 23, 2025.
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