Romans 1:5

Romans 1:4 continues this spectacular opening of Paul's It is amazing how much he has packed into a mere introduction! 

The holiness of God really stood out in this verse. The word in Greek used here for holiness is Hagiosune. It means sanctity, or holiness. It is derived from Hagios - holy. It denotes sanctity not santification. it does not need to be proved. It is a character quality for which there is no need to be any proof. It just is. The term Hagiasmos, which speaks of the process of sanctification, has to be proven at each stage. In other words, it is a continual, growing process. This term, Hagiasoms, is never used of Christ Jesus. The term Hagiosune, used here in Romans 1:4 of Jesus Christ, is only used three times in the entire NT. Here in Romans 1:4, in 2 Corinthians 7:1, and in 1 Thes. 3:13.

Romans 1:4
In this verse, the term is being used to describe the holiness of God pervading and molding the scheme of redemption and manifested finally in and by Christ. Here we have the spirit of Sanctity and holiness in what Christ Himself IS: HOLY. In the flesh, Christ did not have to achieve holiness. He simply was Holy. He was holy from eternity past and He will be holy until eternity future.

2 Corinthians 7:1
Therefore, having these promises, beloved, let us cleanse ourselves from all defilement of flesh and spirit, perfecting holiness in the fear of God."

This is the goal of every believer, to be presented before God in a state of holiness of character that does not have to be proven. In fact, it is the final result of our eternal glorification when we reach Heaven. However, it is to be our goal, to strive for that purpose - to have perfect holiness (that does not have to be proven) in the fear of God.

1 Thessalonians 3:11-13 
Now may our God and Father Himself and Jesus our Lord our way to you; and may the Lord cause you to increase and abound in love for one another, and for all men, just as we also do for you: so that He may establish your hearts unblamable in holiness before our God and Father at the coming of the Lord Jesus with all His saints.

This is the ultimate goal, the ultimate destination of every believer: To have the same holiness of character present in us that Christ has in Him. We have the HOPE to look forward to one day of being presented in this way to God. What a day that will be! This kind of holiness is achieved when we see ourselves as we truly are (corrupted and tainted by sin) and as we see who God truly is (Holy, just, perfect, sinless, and forgiving), and out of fear of Him (2 Cor. 7:1) strive to allow the Holy Spirit to perfect us and present us Holy on day.

This type of holiness (Hagiosune) is the ultimate result of the process of sanctification.