The Churches of the Anglican Communion found it necessary to articulate the Anglican identity when Ecumenism between Church groups started to emerge in the late-19th Century. In 1888, the Bishops of the Third Lambeth Conference articulated the Anglican identity with the so-called Chicago-Lambeth Quadrilateral, which was based on four-points:
We believe that the Holy Scriptures of the Old and New Testaments contain all things necessary to salvation, and as being the rule and ultimate standard of faith.
The Historic Episcopate
We believe that the One, Holy, Catholic and Apostolic Church has been administered by and with those whom the Church has called to be Bishops, and said Bishops are in a line of succession going back to Christ's Apostles.
The marks were identified as mission statements over several meetings of the Anglican Consultative Council, and were adopted by the Anglican Church of Canada.
To Proclaim the Good News of the Kingdom
To Teach, Baptize and Nurture New Believers
To Respond to Human Need by Loving Service
To Seek to Transform Unjust Structures of Society, to Challenge Violence of Every Kind and to Pursue Peace and Reconciliation
To Strive to Safeguard the Integrity of Creation and Sustain and Renew the Life of the Earth
The Thirty-nine Articles of Religion, sometimes called the XXXIX Articles, are a set of statements initiated in 1563, and finalized in 1571, which sought to distinguished the emerging beliefs of the Church of English from those of the Roman Catholic Church, as well as other Protestants in Europe. At one time, Anglicans being ordained were required to assent to the Articles, however, since the mid-20th Century, Anglican Churches have moved away from requiring this of the clergy.
The Articles are organized into four groups
The Catholic Faith
Articles I to VIII deal with credal statements.
Articles IX to XVIII deal with the topics of sin, justification, salvation, and damnation.
Articles XIX to XXXI deal with the institutional church, the councils of the church, worship, ministry, and sacramental theology.
Articles XXXII to XXXIX deal with clerical celibacy, excommunication, traditions of the Church, and other issues.