The answer is—both! In other words, we can’t evade our responsibility for everything we do wrong by simply blaming the devil—but on the other hand, we also know he is behind the world’s evils.
Never doubt the devil’s existence, or his determination to do evil. Yes, his ways are often unseen, and much of the time we may not even realize what he is doing. But since the beginning Satan has had only one purpose: to oppose God in every way he possibly can. Sometimes his methods involve deception—although often his actions are open and obvious. But his goal is unchanged: to block God’s will. The Bible says, “For our struggle is not against flesh and blood, but against … the spiritual forces of evil” (Ephesians 6:12).
But do not doubt either our own ability to do great evil. We have rebelled against God—and our rebellion continues to this day. Even when we know what is good, we often turn away and choose to do what is wrong. The Bible says, “The heart is deceitful above all things and beyond cure. Who can understand it?” (Jeremiah 17:9).
This is why we need Jesus Christ. We need Him to protect us from Satan’s schemes, and we also need Him to turn our hearts from evil to good. Is this happening in your life? Don’t be deceived, but put your life into Christ’s hands, and find your hope and security in Him—both now and forever. Jesus said, “I give them eternal life, and they shall never perish; no one will snatch them out of my hand” (John 10:28).