Justification is a external act of God [upon the sinner] as a Judge, acting in a Court of Justice on guilty sinners, and not the internal work of the Spirit on the heart as in 2 Thess 2:13. God is acting upon the principal of Justice, according to His Law, He Justifies the Ungodly, and those be the Elect of God. This Justification is not based upon having been renewed by the Spirit as per Titus 3:5, nor because they have repented or believed, nor any such obedience of theirs, but solely on the Obedience and Blood of Christ. Rom 5:19
19 For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous.
Rom 8:33-34
33Who shall lay any thing to the charge of God's elect? It is God that justifieth.
34Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.