Confiteor Deo omnipotenti
et vobis, fratres,
quia peccavi nimis
cogitatione, verbo, opere et omissione:
mea culpa, mea culpa, mea maxima culpa.
Ideo precor beatam Mariam semper Virginem,
omnes Angelos et Sanctos,
et vos, fratres,
orare pro me ad Dominum Deum nostrum.
I confess to almighty God
and to you, brethren,
that I have sinned exceedingly
in thought, word, deed and omission:
through my fault, through my fault, through my most grievous fault.
Therefore I beseech blessed Mary ever Virgin,
all the Angels and Saints,
and you, brethren,
to pray for me to the Lord our God.
SourceFrom the Roman Missal · Said at the beginning of Mass, beating the breast