How do we know the existence of spiritual warfare is true?

Scripture makes it clear that believers are involved in a spiritual battle, as highlighted in Ephesians 6:12, which declares that our struggle is not against flesh and blood, but against spiritual forces of evil. This acknowledgment of spiritual warfare serves to explain the internal and external struggles many believers face when confronted with doubts, temptations, and guilt. It reinforces the reality that the Christian life is one of conflict, with Satan as the adversary who seeks to undermine faith and assurance in Christ.

Throughout the Bible, we see examples of saints wrestling with the adversary's devices, indicating that such spiritual conflict is not only a part of personal experience but also a systematic battle faced by the church throughout history. This understanding encourages believers to rely on their faith and the promise of victory found in Christ, assuring them that they are equipped with spiritual armor to withstand these attacks.