_Proposition I._ That there is a _Devil_, is a thing Doubted by none but such as are under the Influences of the _Devil_. For any to deny the Being of a _Devil_ must be from an Ignorance or Profaneness, worse than _Diabolical_. _A Devil._ What is _that_? We have a Definition of the Monster, in _Eph. 6.12._ _A Spiritual Wickedness_, that is, _A wicked Spirit_. A Devil is a _Fallen Angel_, an Angel _Fallen_ from the Fear and Love of God, and from all Celestial Glories; but _Fallen_ to all manner of Wretchedness and Cursedness. He was once in that Order of Heavenly Creatures, which God in the Beginning made _Ministering Spirits_, for his own peculiar Service and Honour, in the management of the Universe; but we may now write that Epitaph upon him, _How art thou fallen from Heaven! thou hast said in thine Heart, I will Exalt my Throne above the Stars of God; but thou art brought down to Hell!_ A Devil is a _Spiritual_ and _Rational_ Substance, by his _Apostacy_ from God, inclined unto all that is Vicious, and for that _Apostacy_ confined unto the Atmosphere of this Earth, _in Chains under Darkness, unto the Judgment of the Great Day_. This is a _Devil_; and the _Experience_ of Mankind as well as the _Testimony_ of Scripture, does abundantly prove the Existence of such a Devil. About this _Devil_, there are many things, whereof we may reasonably and profitably be Inquisitive; such things, I mean, as are in our Bibles Reveal'd unto us; according to which if we do not speak, on so _dark_ a Subject, but according to our own uncertain, and perhaps humoursome Conjectures, _There is no Light in us._ I will carry you with me, but unto one Paragraph of the Bible, to be informed of three Things, relating to the _Devil_; 'tis the Story of the _Gadaren Energumen_, in the fifth Chapter of _Mark_.