So R.C. Sproul stands in front of a seminary class and asks the question, “How many of you believe God’s revelation in scripture is infallible?” They all raised their hand.
Then he asked, “Well how many of you believe God’s revelation in nature is infallible?” Nobody raised their hand. “How can that be?” Sproul asks. “It’s the same God giving the revelation.”
All truth is God’s truth.
You might want to check out the video. Sproul says it so much better than I can.