Luther: Gospel

The quote is attributed to Luther throughout books and quote sites. However, there is no direct place that individuals can point to where Luther mentioned this concept.

The thought comes from Puritan thought-process. Here is their thought:

God had given us two books; the book of nature and the book of revelation.

Many individuals are uncomfortable with the statement and even think that Luther would not mention this concept. However, there can be some Scriptural thought to consider and it comes from the Book of Romans (Chapter 1):

 18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. 19 For what can be known about God is plain to them, because God has shown it to them. 20 For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse 

Charles Plauger wrote the following in a discussion on the quote and the meaning:

 I'm not sure if Luther wrote this or not. But, the context of the statement is of the utmost importance. God does display the gospel outside of scripture, for God himself resides outside of scripture. His love and glory exist beyond such bounds, and so they can be readily seen in all of his creation

I love the statement and believe it is true. What do you think of the quote ?