Which of these lines from John Milton's Paradise Lost provide clues to his purpose in writing the epic poem?

Wast present, and with mighty wings outspread
Dove-like sat'st 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 highth of this great Argument

I may assert th' Eternal Providence,
And justifie the wayes of God to men.
Say first, for Heav'n hides nothing from thy view
Nor the deep Tract of Hell, say first what cause
Mov'd our Grand Parents in that happy State,

Question

Which of these lines from John Milton's Paradise Lost provide clues to his purpose in writing the epic poem?

Wast present, and with mighty wings outspread 
Dove-like sat'st 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 highth of this great Argument 

I may assert th' Eternal Providence, 
And justifie the wayes of God to men. 
  Say first, for Heav'n hides nothing from thy view 
Nor the deep Tract of Hell, say first what cause
Mov'd our Grand Parents in that happy State,