Continuity.

I learned this from Bill Murray in Ghost Busters. Cleanliness isn't a discrete property. There are many levels before something turns from clean to dirty. It's continuous. I thank him for such profound idea.
The truth is, life operates similarly.
The Most High teaches us that there are just good and evil; just like black and white. No gray. In real life, somehow, i fail to fathom the principality of that. I believe that there is good in every man, even just a little, there is. It is designed that way, even though free will screws up the original plan. And if that's so, then there's good in an evil man. Or there's white in black. As colorblind as i am would know that is gray. Unless it's just a white dot on a piece of black paper.
When we recognize the continuity in many other issues, we may just find new insights, or even solutions.