Canticle 10 of the BCP (pp. 86-87), also known as the Second Song of Isaiah, based on Is 55:6-11. Many OT scholars identify the author of this canticle to be Deutero-Isaiah, or Second Isaiah, who lived some 150 years after Isaiah of Jerusalem during the Babylonian exile. This canticle begins, "Seek the Lord while he wills to be found; call upon him when he draws near." This canticle urges the wicked to forsake their ways, and turn to the Lord who will have compassion and richly pardon. The BCP suggests its use at Morning Prayer on Fridays after the OT reading, except in Lent, and at Evening Prayer after the OT reading on Tuesdays (pp. 144-145). The Hymnal 1982 provides six musical settings for the Quaerite Dominum (S 217-S 222).
Glossary definitions provided courtesy of Church Publishing Incorporated, New York, NY,(All Rights reserved) from "An Episcopal Dictionary of the Church, A User Friendly Reference for Episcopalians," Don S. Armentrout and Robert Boak Slocum, editors.