How do we know that spiritual battles are a part of Christian life?

The presence of spiritual battles in a Christian's life is supported by numerous biblical references. For instance, the battle with Amalek occurred right after the Israelites' deliverance from Egypt, which illustrates that while they were redeemed, they were not free from conflict. In 1 Samuel 15, God commands Saul to utterly destroy the Amalekites, emphasizing the necessity of confronting the flesh. This reflects the ongoing fight against sin that believers experience; spiritual battle is not a one-time event but a lifelong struggle against the remnants of sin. Therefore, knowing that these battles are scripturally affirmed reassures Christians of their need for reliance on Christ and the power of the Gospel in this struggle.