From 1979 Book of Common Prayer, pages 876-878.
Adopted by the House of Bishops, Chicago, 1886
Furthermore, Deeply grieved by the sad divisions which affect the Christian Church in our own land, we hereby declare our desire and readiness, so soon as there shall be any authorized response to this Declaration, to enter into brotherly conference with all or any Christian Bodies seeking the restoration of the organic unity of the Church, with a view to the earnest study of the conditions under which so priceless a blessing might happily be brought to pass.
We, Bishops of the Protestant Episcopal Church in the United States of America, in Council assembled as Bishops in the Church of God, do hereby solemnly declare to all whom it may concern, and especially to our fellow-Christians of the different Communions in this land, who, in their several spheres, have contended for the religion of Christ:
But furthermore, we do hereby affirm that the Christian unity . . .can be restored only by the return of all Christian communions to the principles of unity exemplified by the undivided Catholic Church during the first ages of its existence; which principles we believe to be the substantial deposit of Christian Faith and Order committed by Christ and his Apostles to the Church unto the end of the world, and therefore incapable of compromise or surrender by those who have been ordained to be its stewards and trustees for the common and equal benefit of all men.
As inherent parts of this sacred deposit, and therefore as essential to the restoration of unity among the divided branches of Christendom, we account the following, to wit:
Note: While the above form of the Quadrilateral was adopted by the House of Bishops, it was not enacted by the House of Deputies, but rather incorporated in a general plan referred for study and action to a newly created Joint Commission on Christian Reunion.
Lambeth Conference of 1888, Resolution II
That, in the opinion of this Conference, the following Articles supply a basis on which approach may be by God’s blessing made towards Home Reunion: