Perhaps you are thinking about Edwards' use of the term "rational"? I can see what he's saying in that, the more knowledge and understanding we have of a Bible doctrine, the more we appreciate it. For example, when we studied Hebrews in my high-school Bible class, it really bolstered my assurance because I hadn't understood all the Old Testament imagery behind what Christ was fulfilling in on the cross.
That said, I don't think the term "rational" would apply to every apprehension of truth in that there are things that remain a mystery to us. And Edwards would acknowledge that too, I'm sure!
Reformed Baptist Church
"I am not worthy of the least of all the mercies and of all the truth which You have shown Your servant" (Gen. 32:10)
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