Not only the things of nature, but the sacrificial service and the Scriptures themselves - all given to reveal God - were so perverted that they became the means of concealing Him.
Christ sought to remove that which obscured the truth. The veil that sin has cast over the face of nature, He came to draw aside, bringing to view the spiritual glory that all things were created to reflect. His words placed the teachings of nature as well as of the Bible in a new aspect, and made them a new revelation.