The document is an instrument of the papal post-synodal Magisterium which provides particularly applicable pastoral teaching to assist the Church in Oceania in her work of evangelizing all — Church members and others — in the Pacific region. Ecclesia in Oceania is mainly composed of four chapters based on the elements in the formulation of the synod theme: “Jesus Christ and the Peoples of Oceania: Walking His Way, Teaching His Truth, Living His Life”. In this regard, the Holy Father states: “the theme is inspired by the words of John´s Gospel where Jesus refers to himself as the Way, the Truth and the Life (Jn 14:6) and it recalls the invitation which he extends to all the peoples of Oceania; they are invited to meet him, to believe in him, and to proclaim him as the Lord of all.
It also reminds the Church in Oceania that she gathers together as the People of God journeying on pilgrimage to the Father. Through the Holy Spirit, the Father calls believers — individually and in community — to walk the way that Jesus walked, to tell all nations the truth that Jesus revealed, to live fully the life that Jesus lived and continues to share with us now” (8). The Holy Father has also chosen to introduce each chapter with Scriptural icons, indicative of Oceania and its peoples who are scattered, for the most part, on innumerable islands in a vast expanse of water and are dependent on the sea for food and travel.