"...to whom it is due..."

Interesting verse. 

Proverbs 3:27-28(NKJV)

27    Do not withhold good from those to whom it is due,      When it is in the power of your hand to do so.

28    Do not say to your neighbor,     “Go, and come back,     And tomorrow I will give it,”     When you have it with you.
 

Here is what I find interesting about the verse.  It goes to what I perceive as the belief that "the saintly poor" are entitle to all the benefits of being a Christian whether they believe or not.

Notice what it says.  "Do not withhold good from those to whom it is due,".  Doesn't that indicate then that there are some to whom good is not due?  What will be interesting as I continue studying this issue is what guidance Scripture gives us on how to make the determination as to whom good is due.