In Rome the Kyrie was originally sung by the clergy and people; later by two choirs that repeated it alternately until the celebrant gave the sign to cease. The custom of invoking the divine mercy nine consecutive times in the Roman liturgy has been prescribed and practised since the eleventh century.
The three divine persons are separately and consecutively invoked: first the Father by the Kyrie eleison (Lord, have mercy) then the Son by the Christe eleison, and finally the Holy Ghost by the Kyrie eleison. The invocation of each of the divine persons is repeated exactly three times to signify that with each of the divine persons the two others are at least virtually invoked, since by the fact of their mystical indwelling in one another (circumincession) all three of the divine persons are eternally in one another. Other meanings founded for the most part in devotion have also been given to this ninefold cry for mercy; thus, for instance, the ninefold signification of the Kyrie is devoutly thought to refer to the nine kinds of sins and wants, or it has been said that thereby we express our desire of union with the nine choirs of angels.
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