We find ourselves today, on the second of three days, when we are invited to pray specifically for the ministry of the church, and those engaged in it. So, on one day we pray for those to be ordained; on the second, for the choice of suitable persons for the ministry; and on the third, for all Christians in their vocations. Historically these are called Ember Days, and they happen four times a year: in Advent, Lent, just after Trinity Sunday, and in the middle of September.
While today these Ember Days are associated with prayer for the ministry of the church, it was not always so. Liturgical scholars believe their placement in the four quarters or cycles of the year, or quatuor tempora, in Latin, or ymbren ryne in Anglo-Saxon, which is where our word ember comes from, is no accident. It is thought that originally these days were associated with the agricultural cycle of the year: spring, summer, fall, and winter. If that is the case, the origin of Ember Days predates the history of the church, and prayers for ministry, and reaches back to our pre-Christian, agricultural forebears.