And I will place within them as a guide My umpire conscience, whom if they will hear Light after light well used they shall attain, And to the end persisting, safe arrive.
From Man or Angel the great Architect Did wisely to conceal, and not divulge, His secrets, to be scanned by them who ought Rather admire. Or, if they list to try Conjecture, he his fabric of the Heavens Hath left to their disputes - perhaps to move His laughter at their quaint opinions wide Hereafter, when they come to model Heaven And calculate the stars: how they will wield The mighty frame: how build, unbuild, contrive To save appearances; how gird the Sphere With Centric and Eccentric scribbled o'er, Cycle and Epicycle, Orb in Orb.
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 is in me dark Illumine, what is low raise and support; That to the heighth of this great Argument I may assert Eternal Providence, And justify the ways of God to men.