This is the first 25 lines of the Epic poem Paradise Lost.
I can't explain much about it because it is only the first 25 lines.
By. John Milton
Of Mans First Disobedience, and the Fruit
Of that Forbidden Tree, whose mortal tast
Brought Death into the World, and all our woe,
With loss of Eden, till one greater Man
Restore us, and regain the blissful Seat,
Sing Heav'nly Muse, that on the secret top
Of Oreb, or of Sinai, didst inspire
That Shepherd, who first taught the chosen Seed,
In the Beginning how the Heav'ns and Earth
Rose out of Chaos. Of if Sion Hill
Delight thee more, and Siloa's Brook that flow'd
Fast by the Oracle of God; I thence
Invoke thy aid to my adventrous Song,
That with no middle flight intends to soar
Above th'Aonian Mount, while it pursues
Things unattempted yet in Prose of Rhime.
And chiefly Thou O Spirit, that dost prefer
Before all Temples th'upright heart and pure,
Instruct me, for Thou know'st; Thou from the first
Wast present, and with mighty wings outspread
Dove-like satst brooding on the vast Abyss
And mad'st it pregnant: What in me is dark
Illumine, what is low raise and support;
THat to the hight of this great Argument
I may assert th'Eternal Providence,
And justifie the wayes of God to men.