This year marks the 1,700th anniversary of the first Christian Ecumenical Council, held in Nicaea, near Constantinople in 325 AD. This commemoration provides a unique opportunity to reflect on and celebrate the common faith of Christians, as expressed in the Creed formulated during this Council; a faith that remains alive and fruitful in our days. The Week of Prayer for Christian Unity 2025 offers an invitation to draw on this shared heritage and to enter more deeply into the faith that unites all Christians.