Invited?

I continue to battle with the sparrows in the yard.  I think we've gotten rid of them in the back, but just yesterday we discovered that they had built a complete nest in the front bird house!  They had not yet laid any eggs, but I'm sure they were very close.

As I was crabbing to myself about these stinkin' sparrows, I realized that these sparrows had not just "popped up" on their own; they had been invited.  Someone, with no foresight, had invited these house sparrows where they didn't belong and where they weren't wanted, under the mistaken thought that it couldn't hurt.  Here's another interesting thought - house sparrows are ONLY found near humans.

Seems to me that's very similar to sin.  Sin was invited into a perfect world, where it didn't belong and where it wasn't wanted, under the mistaken thought that it couldn't hurt - and it centers around humans.  Now, we fight a continual battle with sin.  Sometimes it's big and obvious and stubborn.  Sometimes it seems to be gone, but "pops up" when you least expect it.  Either way, it's never truly gone, it just waits to be invited back.