This article from John Frame cuts through a lot of the common misunderstandings of the relationship and use of special revelation (Scripture) and natural revelation. Note that Frame (and Van Til) do not deny that we can learn truth from our reason and our senses interacting with the rest of God’s creation. There is no such thing as “pure biblicism.” But general revelation was never meant to stand alone, even before the fall. There is no “pure nature” or “pure natural revelation.” The two forms of revelation work together and belong together. Thus, we are also always obligated to use Scripture, and we must use Scripture to interpret general revelation properly.