What does the Bible say about sin and its effect on believers?

The Bible teaches that sin profoundly affects every believer, leading to an awareness of our unworthiness before God. In Romans 7:18, the Apostle Paul expresses that 'in me, that is, in my flesh, dwelleth no good thing,' signifying the total depravity that comes from our sinful nature. This concept underscores that believers, by the work of the Holy Spirit, begin to perceive their blackness, symbolizing the multitude of sins that we accumulate, reminding us of our need for grace and redemption. Each believer should internalize that, without the recognition of this sinfulness, we cannot fully appreciate the grace granted through the atoning work of Christ.