That what is good comes from the sort of thing that one is, is not all that controversial.

But since that's precisely the thing we're arguing about, to present it as your premise is begging the question, per the definition I quoted.

In addition to that, it's not even relevant. I could equally say, "what is bad comes from the sort of thing that one is", and use this to prove that we should discard bad feelings. So stating it isn't actually reducing the original problem in any way.

That I'm taking fairly standard philosophical views and arguing using logic should not equate to "just babbling".

Actually, given most philosophy I've seen, I'd say that'd be a pretty fair assessment. ;-)