How do we know that the devil is a real enemy?

Scripture provides a clear depiction of the devil as a genuine and formidable enemy. J.C. Ryle notes that the devil has been at work for nearly 6000 years aiming to ruin humanity. He is referred to as a 'murderer' and a 'liar' in John 8:44, which signifies his malign intent towards the souls of men. The narrative of Jesus’ temptation illustrates that even the Son of God was not exempt from his attacks. This awareness of the devil’s reality should serve as a motivation for believers to remain vigilant, to pray, and to arm themselves with the Word of God as their defense against his schemes.