What does the Bible say about the struggle of believers?

In Romans 7, the Apostle Paul illustrates the real struggle that believers face in their daily lives. He acknowledges that when he desires to do good, evil is present with him (Romans 7:21). This struggle reflects the war between the flesh and the spirit within every believer, emphasizing that even after conversion, they still contend with sin in their members. Paul poignantly describes himself as wretched, highlighting the ongoing nature of this internal conflict. Such passages remind believers of their reliance on Christ's work, reinforcing the truth that while they may strive for holiness, they inevitably face the reality of indwelling sin and their need for grace.