THROUGH MY FAULT,
THROUGH MY FAULT,
THROUGH MY MOST GRIEVOUS FAULT.

Confíteor Deo omnipoténti et vobis, fratres,
quia peccávi nimis
cogitatióne, verbo, ópere et omissióne:
et, percutientes sibi pectus, dicunt:
mea culpa, mea culpa, mea máxima culpa.
Ideo precor beátam Maríam semper Vírginem,
omnes Angelos et Sanctos,
et vos, fratres, oráre pro me
ad Dóminum Deum nostrum.

I confess to almighty God,
and to you, my brothers and sisters,
that I have greatly sinned,
in my thoughts and in my words,
in what I have done and in what I have failed to do,
through my fault, through my fault,
through my most grievous fault;
therefore I ask blessed Mary ever-Virgin,
all the Angels and Saints,
and you, my brothers and sisters,
to pray for me to the Lord our God.

We used to say:

I confess to almighty God,
and to you, my brothers and sisters,
that I have sinned through my own fault
in my thoughts and in my words,
in what I have done,
and in what I have failed to do;
and I ask blessed Mary, every virgin,
all the angels and saints,
and you, my brothers and sisters,
to pray for me to the Lord our God.

About

At the start of each Mass, the priest and faithful acknowledge their sins. We acknowledge our sinfulness thereby coming to the altar of God with a greater humility and proper disposition for what is a participation in the Liturgy of Heaven. The Missal also asks that we perform the ancient action of striking our breast during the lines “through my fault, through my fault, through my most grievous fault”, coordinating a sacramental action with sacramental words.