Pure Spring Water w/ just a drop of Piss

I could probably use a more tasteful analogy but I cannot think of one that is more direct. If you got a drink of water from the purest spring water ever and someone dropped just a little bit of their pee in it would you drink it? 999.999% pure and .001% polluted.

This is what I think about when I read the following:
"Like a muddied spring or a polluted well is a righteous man who gives way to the wicked." Proverbs 25:26(NIV)

The application of this verse is: A little bit of poison destroys and wastes a lot of purity.