What does the Bible say about sinning?

The Bible clearly states in 1 John 2:1, 'My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous.' This verse emphasizes both the call to holiness and the comfort of having an advocate to intercede for us if we fail. While believers are called to live in a way that reflects their new identity in Christ, it is acknowledged that sin will still be present in their lives. John gently instructs the church, highlighting the simultaneous reality of striving for holiness and the assurance of grace when we fall short.