The words of John Calvin,
“Now in describing the world as a mirror in which we ought to behold God, I do not want to be understood as asserting either that our eyes are sufficiently clear-sighted to discern what the fabric of heaven and earth represents or that the knowledge to be hence attained is sufficient for salvation. And whereas the Lord invited us to himself by the means of created things, with no other effect than that of thereby rendering us inexcusable, he has added (as was necessary) a new remedy; or at least by a new aide he has assisted in the ignorance of our mind. For by the Scriptures as our guide and teacher, he not only makes those things plain that would otherwise escape our notice, but he almost compels us to behold them, as if he had assisted our dull sight with spectacles” (From the Crossway Classic Commentaries Series, edited by Alister McGrath and J.I Packer, page xiii and xiv)
The ramification of these sentences are huge, in regards to the discussion of General and Special Revelation.