What does the Bible say about the believer's inability?

According to Romans 7, believers experience a constant struggle between their old nature (the flesh) and their new nature (the Spirit). Paul illustrates this by pointing out that although believers may desire to do good, they often find themselves doing what they hate. This inability highlights the reality of sin still dwelling within despite being redeemed. The law serves to reveal sin, demonstrating that our prior nature cannot uphold God's standards of holiness, thus emphasizing our reliance on Christ for salvation and sanctification.