Hard-Headed, Hard-Hearted

Now here's a dirty story.  Once there was a group of people who God loved and blessed - immensely... with lands and homes and every sort of success imaginable.  But then, over time, something happened that led to their turning against the One who'd blessed them.  They became ingrates.  How did that happen?  Does it still happen?  Is there a way to avoid it happening to us?