To explain one thing about "rational." It did not mean "logical." It is one word which was pretty much destroyed by the translators of Freud and Nietzche who gave us the terminally confused word, "rationalize."
The rational soul is capable of choosing consciously. In that respect, it can be said to be logical. But it can also choose to base its decision on faith, not mere logic. Hence, "rational" can mean "faith-based" OR "logical," as opposed to "fear-based" or "primal" or "instinctive."
So when early Christians equate "rational" with good, they are dismissing the spiritual intuition or faith, as they may seem to the post-Freudian, American reader. Rather, they are equating with making decisions based on an informed conscience, rather than one "of the flesh."
Oops!
"they are dismissing" should read "they are NOT dismissing."