Martyn Lloyd-Jones
We must never look at any sin in our past life in any way except that which leads us to praise God and to magnify His grace in Christ Jesus.

And even if our gospel is veiled, it is veiled to those who are perishing. In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.
2 Corinthians 4:3-4