Union Among the Churches of the Anglican Communion - Encyclical Letter 1.10: Of of Day of Intercession
Remembering the blessing promised to united intercession, and believing that such intercession ever tends to deepen and strengthen that unity of his Church for which our Lord earnestly pleaded in his great intercessory prayer, your Committee trust that this Conference will give the weight of its recommendation to the observance, throughout the Churches of this Communion, of a season of prayer for the unity of Christendom. This recommendation has been, to some extent, anticipated by the practice adopted of late years of setting apart a Day of Intercession for Missions. Your Committee would by no means wish to interfere with an observance which appears to have been widely accepted, and signally blessed of God. But, as our divine Lord has so closely connected the unity of his followers with the world's belief in his own mission from the Father, it seems to us that intercessions for the enlargement of his Kingdom may well be joined with earnest prayer that all who profess faith in him may be one flock under one Shepherd. With respect to the day, your Committee have been informed that the Festival of St. Andrew, hitherto observed as the Day of Intercession for Missions, is found to be unsuitable to the circumstances of the Church in many parts of the world. They, therefore, venture to suggest that, after the present year, the time selected should be the Tuesday before Ascension Day (being a Rogation Day), or any of the seven days after that Tuesday; and they hope that all the bishops of the several Churches will commend this observance to their respective dioceses.
[NOTE: The Lambeth Conference of 1878 did not adopt any formal Resolutions as such. The mind of the Conference was recorded by incorporating the Reports of its five Committees, received by the plenary Conference with almost complete unanimity, into an Encyclical Letter which was duly published. Recommendations embodied in the Committee Reports were evidently accorded equivalent status to formal Resolutions, and they are reproduced here as they appeared in the course of the Encyclical Letter, under appropriate reference.]