Collect for Purity

The Collect for Purity predates the Reformation considerably, circulating in medieval Latin sacramentaries as a private prayer said by the priest while vesting or approaching the altar before Mass, well before Thomas Cranmer translated and repositioned it as the opening prayer of the entire English communion service in the sixteenth-century Book of Common Prayer. That repositioning changed its function significantly: what had been a priest's personal preparatory prayer, said quietly and not necessarily heard by the congregation, became a public prayer spoken aloud at the very start of the service, asking on behalf of the whole gathered community that God cleanse the thoughts of their hearts through the inspiration of the Holy Spirit. Its opening address, to whom all hearts are open, all desires known, and from whom no secrets are hid, sets a tone of complete divine knowledge of the worshipper's inner life before a single petition is even made, a structure liturgical scholars have noted gives the prayer unusual theological weight for its brevity. Cranmer's English translation has remained remarkably stable across nearly five centuries of subsequent prayer book revision, unlike many other texts from the same original 1549 book that were later altered, shortened or removed entirely.

As the opening prayer of the Anglican communion service, the Collect for Purity performs a distinct liturgical function compared to the collects that follow it later in the service: where those later collects typically address the specific theme of the day or season in the church calendar, this one addresses the general condition of the worshippers themselves, asking for cleansed thoughts before any particular topic or scripture reading is introduced. Its brevity, a single sentence in most translations, has kept it largely unchanged even in modern-language revisions of Anglican liturgy that have significantly reworded longer or more archaic-sounding prayers elsewhere in the service, suggesting liturgists have generally regarded its wording as already about as economical as the content allows. It is recited or sung by the presiding minister, sometimes with the congregation responding, depending on the specific rite in use, and its placement immediately following the opening acclamation and before the collect of the day marks the formal transition from the gathering of the community into the structured, thematic portion of the liturgy proper. Its continued presence across the wide range of Anglican provinces and prayer book traditions worldwide makes it one of the more consistently preserved elements of Cranmer's original liturgical design.