Kraggh-- this is awesome! I'm so glad you've shared this with BZP, even if only two people are gonna comment on it. And I totally am on the same page as you regarding that passage about love; it's definitely from the reliable source. : D
... Though I can't say I fully understand what you're saying here. I would define truth as more what is true, i.e. what corresponds to/is reality. Something we know to be true would be something that we know that is... eh, I'd say evidenced by reality, if you know what I mean by that.
I would argue that most people do naturally have at least some knowledge of sin (which I would also argue is not merely a concept, but actually a reality; namely, doing what is wrong). Morality subjective to each individual? Hmm. How is that?
Ethics? Isn't it simply the study of or subject of morality and such?
~7