These are a variety of prayers that Catholics use, though many can be used by Christians of any faith:
Glory be to the Father and to the Son and to the Holy Spirit;
As it was in the beginning, is now and ever shall be,
World without end.
O My Jesus
O my Jesus,
Forgive us our sins,
Save us from the fires of hell,
Lead all souls to heaven,
Especially those in most need of thy mercy.
Hail Mary, full of grace, the Lord is with thee.
Blessed art thou among women,
And blessed is the fruit of thy womb, Jesus.
Holy Mary, Mother of God,
Pray for us sinners, now and at the hour of our death.
O my God,
I am heartily sorry for having offended You, knowingly or unknowingly
I have sinned in thought, word and deed.
I have sinned in what I have done, and in what I have failed to do.
I come before You and ask for the grace of a deeply repentant heart
You know my innermost secrets.
I open my heart to You today
And ask You to show me the ways I have blocked the flow of Your love.
Forgive me, Father, for all my offenses, faults and failings.
I detest all my sins, because they offend You
And separate me from You, my God,
Who are all-good and deserving of all my love.
For these offenses I beg pardon today.
I firmly resolve, with the help of Your grace,
To offend You no more and to avoid the near occasion of sin.