What does the Bible say about sin and believers?

The Scriptures affirm that every believer struggles with sin, as echoed in 1 John 1:8-10 which states that if we say we have no sin, we deceive ourselves. This inherent sinful nature does not negate our salvation; rather, it emphasizes our continual need for Christ's cleansing. Romans 3:23 reiterates that all have sinned and fall short of the glory of God, indicating that sin is part of the human condition. However, believers find hope in Christ's atonement, as articulated in 1 John 2:1-2, where we see Jesus as our advocate, the righteous one, who is the propitiation for our sins, thus securing our forgiveness.