Act of Contrition - Catholic Prayer

O my God, I am heartily sorry for having offended Thee,
and I detest all my sins,
because I dread the loss of heaven and the pains of hell,
but most of all because they offend Thee, my God,
who art all-good and deserving of all my love.
I firmly resolve, with the help of Thy grace,
to confess my sins, to do penance,
and to amend my life. Amen.