A prayer of confession which is part of the Roman Rite. In Latin:
CONFITEOR Deo omnipotenti, beatae Mariae semper Virgini, beato Michaeli Archangelo, beato Ioanni Baptistae, sanctis Apostolis Petro et Paulo, et omnibus Sanctis, quia peccavi nimis cogitatione, verbo et opere: mea culpa, mea culpa, mea maxima culpa. Ideo precor beatam Mariam semper Virginem, beatum Michaelem Archangelum, beatum Ioannem Baptistam, sanctos Apostolos Petrum et Paulum, et omnes Sanctos, orare pro me ad Dominum Deum nostrum. Amen

My poor translation follows. It is not copyrighted, but it also may not be very accurate.

Note: several years after my initial translation, I make several changes. 1) remove the remaining articles (except "the" between John and Baptizer), 2) to include the word "nostrum" as "our" in front of Lord God, 3) to remove "who is" after Mary, and 4) to at "to" before "all saints"

All in all, it's a slightly improved translation, though I still make no claim as a scholar of Latin.

I admit to all-powerful God, to blessed Mary, always-virgin, to blessed Michael, top angel, to blessed John the Baptizer, to holy apostles Peter and Paul, and to all saints, that I have thoroughly messed up in thought, word, and action: through my fault, my fault, my heinous fault. Because of this, I ask blessed Mary, always-virgin, blessed Michael, top angel, blessed John the Baptizer, holy apostles Peter and Paul, and all saints to talk to our Lord God for me. Amen.