In 1935 Abbé Paul Couturier, a French priest, addressed this problem by promoting prayer for Christian unity on the inclusive basis that "our Lord would grant to his Church on earth that peace and unity which were in his mind and purpose, when, on the eve of His Passion, He prayed that all might be one." A huge ecumenical step was taken in 1964 with the issuing of the Decree on Ecumenism of Vatican Council II. The Decree was clear for Roman Catholics: "In certain special circumstances, such as in prayer services for unity and during ecumenical gatherings, it is allowable, indeed desirable, that Catholics should join in prayer with their separated brethren.” Today the Week of Prayer for Christian Unity and Interreligious Dialogue belongs to all people of faith who wish, as Jesus did, "that all may be one". The formation of official ecumenical dialogues among Christians and between non-Christian bodies reinforces the value of such a yearly observance.
A dear deceased Trappist monk friend of mine, Fr. Brendan, OCSO, once sent me this quote: “The schisms, persecutions, and polemics of our yesterdays [today] begin to assume a certain unreality...As the Christian world once split on the dipthong, so have Christians killed each other for a definition. That they should quarrel and divide within the great area of mystery created by the Incarnation, which they share and live by, becomes increasingly unacceptable. The most elementary lesson of a faith held in common is to love, and so to understand one another...”