When it is recalled that until the Christian era the underworld was never regarded as a hostile area, that all gods were useful and essentially friendly to man despite occasional lapses; when we see the steady and methodical inculcation into humanity of the idea of man’s worthlessness — until redeemed — the necessity of the Devil may become evident as a weapon, a weapon designed and used time and time again in every age to whip men into a surrender to a particular church or church-state.

The concept of unity, in which positive and negative are attributes of the same force, in which good and evil are relative, ever-changing, and always joined to the same phenomenon — such a concept is still reserved to the physical sciences and to the few who have grasped the history of ideas. When it is recalled that until the Christian era the underworld was never regarded as a hostile area, that all gods were useful and essentially friendly to man despite occasional lapses; when we see the steady and methodical inculcation into humanity of the idea of man’s worthlessness — until redeemed — the necessity of the Devil may become evident as a weapon, a weapon designed and used time and time again in every age to whip men into a surrender to a particular church or church-state.

"The greatest trick the devil ever pulled was convincing the world he didn't exist," said Verbal Kint (paraphrasing Charles Baudelaire) in The Usual Suspects. This might have been true back in Kint's heyday, but nowadays it's depressingly obvious that devils do indeed exist, clad in the trappings of politics, religion or super-wealth as they sow conflict, contagion, oppression and conspiracy theories throughout the world.

The Devil, dearest daughter, is the instrument of My Justice to torment the souls who have miserably offended Me. And I have set him in this life to tempt and molest My creatures, not for My creatures to be conquered, but that they may conquer, proving their virtue, and receive from Me the glory of victory. And no one should fear any battle or temptation of the Devil that may come to him, because I have made My creatures strong, and have given them strength of will, fortified in the Blood of my Son, which will, neither Devil nor creature can move, because it is yours, given by Me.

Journalist: Does the devil exist? Arturo Sosa: In several ways. You have to understand the cultural elements to refer to this character. In the language of Saint Ignatius it is the evil spirit that leads you to do things that go against the spirit of God. It exists as evil personified in different structures but not in people, because it is not a person, it is a way of carrying out evil. He is not a person like a human person is. It is a way of evil being present in human life. Good and evil are in constant struggle in human consciousness, and we have ways of indicating them. We recognize God as good, entirely good. Symbols are part of reality, and the devil exists as a symbolic reality, not as a personal reality.

The devil, depend upon it, can sometimes do a very gentlemanly thing.

[W]e conceive the Devil as a necessary part of a respectable view of cosmology. Ours is a divided empire in which certain ideas and emotions and actions are of God, and their opposites are of Lucifer. It is as impossible for most men to conceive of a morality without sin as of an earth without 'sky'. Since 1692 a great but superficial change has wiped out God's beard and the Devil's horns, but the world is still gripped between two diametrically opposed absolutes. The concept of unity, in which positive and negative are attributes of the same force, in which good and evil are relative, ever-changing, and always joined to the same phenomenon - such a concept is still reserved to the physical sciences and to the few who have grasped the history of ideas.

Readers are advised to remember the devil is a liar.

The church must not abandon its belief in devils. Orthodoxy cannot afford to put out the fires of hell. Throw away a belief in the devil, and most of the miracles of the New Testament become impossible, even if we admit the supernatural. If there is no devil, who was the original tempter in the garden of Eden? If there is no hell, from what are we saved; to what purpose is the atonement? Upon the obverse of the Christian shield is God, upon the reverse, the devil. No devil, no hell. No hell, no atonement. No atonement, no preaching, no gospel.

I believe that the greatest trick of the devil is not to get us into some sort of evil but rather have us wasting time. This is why the devil tries so hard to get Christians to be religious. If he can sink a man's mind into habit, he will prevent his heart from engaging God.

The devil is not abroad at night in the form of a cat or a wolf or any other animal. He lives eternally in the hearts of men.

In Black Magic, the Devil means the employment of the Grand Magical Agent for a wicked purpose by a perverted Will.

The most powerful weapon to conquer the devil is humility. For, as he does not know at all how to employ it, neither does he know how to defend himself from it.

You can find meanness in the least of creatures, but when God made man the devil was at his elbow. A creature that can do anything. Make a machine. And a machine to make the machine. And evil that can run itself a thousand years, no need to tend it.