I'm curious if there are other liturgical documents that I'm unaware of that address specifically the sourcing of invocations of the third form of the penitential act.
When using the third penitential rite, (1) do not speak to the Father, the Spirit, or anyone other than Christ, and (2) do not dwell on human failures, but rather proclaim Christ's mercy and saving qualities. [...]
In practice, this means that the "invocations" should never include the word "we" although they might occasionally tolerate the word "us" or "our". For example, it is incorrect to say: "Lord, for the times we have ignored our sisters and brothers and looked at our own needs: Lord, have mercy." [...]
Rather, the Sacramentary always focuses on Christ, and any innovative invocations for the penitential rite should do likewise. For example:
Lord Jesus, Son of God: Lord, have mercy.
Lord Jesus, you are the Way: Lord, have mercy.
Lord Jesus, you heal our sins: Lord, have mercy.
the three invocations in option (c) never take the form of "For the times we have been selfish, Lord have mercy", etc.
[T]he only time we don’t use confiteor+kyrie are the handful of time we have a sprinkling rite.
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