Who Is The Devil
The short answer
Ask who the devil is and you quickly run into a fork in the road. One answer says the devil is simply a symbol—a vivid personification of the sin that already lives in human hearts. The other answer, which the New Testament writers seem to hold, is stranger and more serious: evil is purposeful, powerful, and cosmic. It works within us, yes, but also outside us. And yet, crucially, it never operates outside the sovereignty of God. The devil in scripture is a real adversary, but never a rival deity. Evil has agency; it does not have the last word.
The temptation of Jesus in the wilderness is where this comes into focus. The devil does not appear there as a cartoonish monster but as a voice making appeals—invitations to disobey God, often dressed up as shortcuts to good ends. Temptation itself is not sin; it is the pull toward disobedience. And the fact that Jesus could genuinely be tempted tells us his humanity was real, not theater.
This is why the theologian Reinhold Niebuhr's famous line lands so hard: the devil is an angel who pretends to be God. Evil at its most developed is not obvious ugliness. It is a good thing that imagines itself better than it is—a creature refusing to accept its limits and grasping at infinity. That is the devil's signature move: not tempting us toward the gutter, but corrupting the highest things through pride and pretense.
So who is the devil? Less a figure with horns than the shape evil takes when a creature claims divinity. If self-centeredness is the engine of sin, dishonesty—pretending to be more than we are—is where it finally ends up. The devil, in other words, is what happens when the good lies about itself.
What scholars say
These excerpts answer the identity question from two angles: Rhodes and March weigh whether the devil is merely a personification of human sin or a sign that evil is purposeful and cosmic yet under God's sovereignty, while Niebuhr names the devil's essential character—a good that pretends to be better than it is, with dishonesty as sin's final expression.
“Some think that the devil (Satan) is only the personification of human sin, but the New Testament writers seem to have a different view. The devil and his demons mean that evil is purposeful, powerful, and cosmic. It is both outside and within humankind, but it is not outside the sovereignty of God. Temptation is not sin but an appeal to disobey God. The temptation of Jesus reminds us that his humanity was real. Jesus was not playacting to put on a good show. There was no hypocrisy in his humanity. Unquestionably the evangelists thought of the parallels between the experience of Jesus and that of Moses and Israel. Their mention of the wilderness, the forty days, and the temptation (or testing) calls to mind a number of Old Testament passages (see Exod.”
“But it would also be impossible if man’s finiteness did not betray him into a corruption of the highest values. This corruption is not due simply to the fact that finite men fail to see far enough, or to envisage reality widely enough, to comprehend the actual center of life. It is also due to the fact that men are tempted to protest against their finiteness by seeking to make themselves infinite. Thus evil in its most developed form is always a good which imagines itself, or pretends to be, better than it is. The devil is always an angel who pretends to be God. Therefore, while egoism is the driving force of sin, dishonesty is its final expression.”
What it means for you
This changes how you watch for evil in your own life. If the devil's signature is a good thing pretending to be God, then the most dangerous temptations rarely look wicked. They look like ambition, devotion, conviction—real goods, quietly inflated past their limits. The practical question is not "Am I doing something obviously bad?" but "Am I being honest about my own finiteness?"
And remember the other half: temptation is not sin. Feeling the pull toward disobedience is not failure—Jesus himself felt it, genuinely. What matters is what you do at the fork, and the steady assurance that whatever evil is, it is never beyond God's rule.
In context
The Gospels place the devil's most vivid appearance right after Jesus's baptism, when he is led into the wilderness for forty days of testing (Matthew 4, Luke 4). The setting is deliberate: the wilderness, the forty days, and the testing all echo Israel's forty years of wandering after the exodus and Moses's own time in the desert. Where Israel failed its wilderness tests, Jesus faces the same kind of trial and stays faithful. The temptation story is where scripture's picture of the devil becomes concrete—an adversary who tempts, and a Lord who resists.