Through faith, we receive the goodness of Jesus. His goodness and love begins to show in our actions. Justification comes through faith. We cannot be justified by our works. Our works should be an expression of the love that God gives us.
Sanctification means to be made holy.
Sanctification is the process we work through with God to allow His holiness to develop in every area of our life. But we ought always to thank God for you, brothers loved by the Lord, because from the beginning God chose you to be saved through the sanctifying work of the Spirit and through belief in the truth. The Holy Spirit works to move us towards Christ and make us more like him. By one sacrifice he has made perfect forever those who are being made holy. We are already perfect, yet we are being made holy.