Holiness from the heart

We still live in a sinful nature while we are set-apart by the Holy Spirit at the time of our salvation.2 Thessalonians 2:13 "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." 2 Corinthians 7:1 "Since we have these promises, dear friends, let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God." We are to offer our bodies (Cost of Discipleship), we are not to look back to our sinful lifestyle before we came to Christ. Romans 12:1 Therefore, I urge you, brothers, in view of God's mercy, to offer your bodies as living sacrifices, holy and pleasing to God—this is your spiritual act of worship. Even thought we are "declared" holy, we still live in a sinful body so Peter reminded us that we are to add "our faith"...... 2 Peter 1:5-9 For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge; and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness; and to godliness, brotherly kindness; and to brotherly kindness, love. For if you possess these qualities in increasing measure, they will keep you from being ineffective and unproductive in your knowledge of our Lord Jesus Christ. But if anyone does not have them, he is nearsighted and blind, and has forgotten that he has been cleansed from his past sins.