What a stupid question, seeing as how from the context of my word, "good", which context is the very sentence in which I wrote it, I clearly refer to 
all good, with no exception.  By your stupidity and your dishonesty, you are doing yourself 
no good.  Note now, if you're able to take a breather away from your perpetual stupidity, what you failed to have noticed before: 
my universal quantifier word, "no".
"You are doing for yourself no good" = "All good is that which you are not doing for yourself".
What you've just done is akin to going up to a sign at a swimming pool that reads, 
"No peeing in the swimming pool!" and saying, 
"Which peeing in the swimming pool are they referring to?"