It is God's will that you should be sanctified, 1 Thessalonians 4:3

The first letter to the thessalonians is a book of the new testament wrote by the apostle Paul. The epistle begins with an invocation to the Holy Spirit and with a thanksgiving. To continue then with an exhortation to holiness and finishing the letter with a mention to the second coming of Jesus Christ.
The apostle emphasizes the expression: "It is God's will that you should be sanctified, 1 Thessalonians 4:3"
The apostle adds: "God has not called us to impurity, but in holiness, 1 Thessalonians 4:7" In this context the concept of holiness is the opposite to impurity and being the impurity a work of the flesh (Galatians 5:19-21), the holiness could be understood as a fruit of the spirit (Galatians 5:22-23).
The apostle in this letter also refers the sanctity as a belonging to the divine, to the spiritual gift of fear of the lord or serenity, this gift is known as constancy, firmness, devotion, ecuanimity, stability. when he affirms: "in order to please God, 1 Thessalonians 4:1".

Spiritual Gift of Perseverance

The Spiritual Gift of Perseverance is the daily determination of doing good and avoiding evil and its distinctive characteristics are the loss of  fear and the resistance.
Remember that the love of charity is the love without passion, or to say the love without fear. Anger, shame and fear are passions; shame and guilt for example are typicals passions of an intermediate state between good and evil.
The Spiritual Gift of Perseverance is the spiritual gift proper of the spiritual man (pneumatic man) or the man gifted by the spirit.
The triple division of man (1 Corinthians 2:14; 1 Thessalonians 5:23): body, soul and spirit gives birth to 3 types of man: the natural man (prevails the body), the rational man (prevails the soul) and the spiritual man (prevails the spirit). This diference among men is because there is an intermediate state between good and evil.
Understand the spiritual man is to understand the eternal life and the perseverance. Perseverance and eternal life allways go together, like face and mint of the same coin.
http://www.quintoevangelio.com.ar/en/articles/item/95-the-spiritual-gift-of-perseverance.html