A brief paragraph, but an important reminder:
230. Sometimes we forget that unity is primarily a gift of the Holy Spirit, and we do not pray much for this intention.
It’s good to remember that praying for unity is an imitation of Christ.
This change of heart and holiness of life, along with public and private prayer for the unity of Christians, should be regarded as the soul of the whole ecumenical movement, and merits the name, “spiritual ecumenism.”(Unitatis Redintegratio 8)
For deeper examination, an English translation of the 2007 document from the Aparecida Conference.