The Sacrament of Penance

The Roman Catholic church teaches that Roman Catholics guilty of mortal sin are justified again through the sacrament of penance (980, 1446].

The Bible teaches that there is no second justification. Those whom God justifies, he also glorifies.

Romans 8:28-30:

And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose. For those whom He foreknew, He also predestined to become conformed to the image of His Son, so that He would be the firstborn among many brethren; and these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified.