In the process of sanctification where we are made partakers of His holiness. This is the progressive work which is begun in regeneration and is carried on in the hearts of believers by the presence and power of the Holy Spirit through the Word of God, self-examination, self-denial, watchfulness, and prayer.

Romans 8:15-17
For you did not receive a spirit that makes you a slave again to fear, but you received the Spirit of sonship. And by him we cry, "Abba, Father." The Spirit himself testifies with our spirit that we are God's children. Now if we are children, then we are heirs—heirs of God and co-heirs with Christ, if indeed we share in his sufferings in order that we may also share in his glory.

Philippians 2:12-13
Therefore, my dear friends, as you have always obeyed—not only in my presence, but now much more in my absence—continue to work out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose.

I Thessalonians 5:23
May God himself, the God of peace, sanctify you through and through. May your whole spirit, soul and body be kept blameless at the coming of our Lord Jesus Christ.