The Nicene Creed, more precisely the Nicene-Constantinopolitan Creed, is the principal confession of faith used in Orthodox and Catholic liturgy.
Formation
The Creed received its foundational form at the First Ecumenical Council of Nicaea in 325 and its received form through the First Council of Constantinople in 381. It confesses the Trinity, the true divinity and humanity of Jesus Christ, His saving death and resurrection, the Holy Spirit, the one holy catholic and apostolic Church, baptism, the resurrection of the dead, and the life of the world to come.
Liturgical use
Recitation of the Creed is both doctrinal confession and an act of worship. It places individual belief within the common faith of the Church. In the United Roman-Ruthenian Church, the historical question of the filioque is handled as follows: In the Gallo-Russo-Byzantine, Anglican Byzantine, and other Eastern Rites of the Church, the filioque is never used. Likewise, it is never used in the Western/Latin Rites of the Church in Greek or Slavic languages.