The Ninth Commandment:
You shall not covet your neighbor's house.
What does this mean?
We should fear and love God so that we do not scheme to get our neighbor's inheritance or house, or get it in a way which only appears right, but help and be of service to him in keeping it.
Ya know, sometimes you just need a reminder. Like when you see this:
Of course, I don't want his library. I want its equivalent that I collect myself. So it's not quite coveting.