Catholic Documents on Ecumenism

1914-1939
Beatified January 25, 1983
Patron of Ecumenism
Feast day: April 22nd

“Blessed Maria Gabriella Sagheddu“. CatholicSaints.Info 

From  Encyclical UT UNUM SINT of Saint Pope John Paul II 

“Together with all Christ's disciples, the Catholic Church bases upon God's plan her ecumenical commitment to gather all Christians into unity. Indeed, "the Church is not a reality closed in on herself. Rather, she is permanently open to missionary and ecumenical endeavour, for she is sent to the world to announce and witness, to make present and spread the mystery of communion which is essential to her, and to gather all people and all things into Christ, so as to be for all an 'inseparable sacrament of unity.”

“It is understandable how the seriousness of the commitment to ecumenism presents a deep challenge to the Catholic faithful. The Spirit calls them to make a serious examination of conscience. The Catholic Church must enter into what might be called a "dialogue of conversion", which constitutes the spiritual foundation of ecumenical dialogue. In this dialogue, which takes place before God, each individual must recognize his own faults, confess his sins and place himself in the hands of the One who is our Intercessor before the Father, Jesus Christ.”

For the entire published encyclical, click here:

“Catholics, in their ecumenical work, must assuredly be concerned for their separated brethren, praying for them, keeping them informed about the Church, making the first approaches toward them. But their primary duty is to make a careful and honest appraisal of whatever needs to be done or renewed in the Catholic household itself, in order that its life may bear witness more clearly and faithfully to the teachings and institutions which have come to it from Christ through the Apostles.”
 
The restoration of unity among all Christians was one of the principal concerns of the Second Vatican Council. 
 
From the Council document Unitatis redintegratio (Latin for "Restoration of unity") and otherwise known as the Decree on Ecumenism:

“The Directory for the Application of Principles and Norms on Ecumenism (DAPNE) (1993) is addressed to the Pastors of the Catholic Church, but it also concerns all the faithful, who are called to pray and work for the unity of Christians, under the direction of their Bishops. The Bishops, individually for their own dioceses, and collegially for the whole Church, are, under the authority of the Holy See, responsible for ecumenical policy and practice.”
 
Aim of the Directory
 
The Directory is meant to be an instrument at the service of the whole Church and especially of those who are directly engaged in ecumenical activity in the Catholic Church. The Directory intends to motivate, enlighten and guide this activity, and in some particular cases also to give binding directives in accordance with the proper competence of the Pontifical Council for Promoting Christian Unity (PCPCU).
 

Read the entirety here: