This exists in his 1813 letter, written in the context of Britain's repeal of a law that made it a crime to deny the Trinity, John Adams writes this to the militant anti-Trinitarian, Thomas Jefferson:
We can never be so certain of any prophecy, or the fulfillment of any prophecy, or of any miracle, or the design of any miracle, as we are from the revelation of nature, that is, nature's God, that two and two are equal to four....This revelation had made it certain that two and one make three, and that one is not three nor can three be one....Had you and I been forty days with Moses on Mount Sinai, and admitted to behold the divine glory, and there been told that one was three and three one, we might not have had the courage to deny it, but we could not have believed it.
Adams says even if the doctrine of the Trinity were revealed to him with Moses on Mt. Sinai, he still wouldn't believe it because man's reason proves 1+1+1=3 not 1. That is the penultimate example of reason trumping revelation. [Do you think it's a little bit arrogant too?]
Adams also says the same theory -- "the laws of Nature and Nature's God" -- which gives America its principles upon which it erected its government also reveals Nature's God to be unitarian!!! I could offer quotes that demonstrate the unitarianism of Jefferson and Franklin as well. And they together made up a majority of the drafting board of the Declaration of Independence. We could say that the Declaration of Independence refutes Trinitarian Christianity. But there's a problem isn't there? There were many Trinitarian Christians in the nation who supported the Declaration of Independence, the Revolution and Constitution. And they didn't understand Nature's God this way.
The problem is easy avoided by being vague and refusing to identify the attributes of God when publicly invoking Him any more than 1) He exists, 2) He created us and grants us rights, and 3) will Intervene to do Justice. This is what American Civil Religion is all about.