"Complaining isn’t just an insignificant, minor, everyday sin. It’s a slap in the face of God. When we complain, we’re saying that God hasn’t been good to us. We’re making a loud statement to ourselves and to the rest of the world that God hasn’t been a good master. As we step back and survey our lives and our circumstances, we come to the following conclusion: God did something wrong. Sure, he’s gotten us out of some jams. Sure, he did the whole salvation thing for us. He’s thrown us a bone every now and then. And yes, he’s given us a family and a house and a car and all that stuff. But overall we’re not too happy with the way God has run things. If it was up to us, things would be a lot different. And so we complain."
From The Greener Grass Conspiracy by Stephen Altrogge