What are the commandments in the Bible that most Christians do not obeying?

It's difficult to point out a single sin, because in some way we are guilty of evryone them. We all steal in some ways we would never thouht of as stealing, like your boss's time or pen or what ever. We kill with our tongue almost every day. We commit adultery with our eyes almost every chance we get. We are guilty of idolatry every single day and probably lying too. Lack of faith is probably the most ocurring one -worrying about all sorts of things. That is a slap in the face of an omnipotent Creator.

to me i think that the main one would have to be "thou shall not lie". everywhere you go now a days you run into someone who has lied, is lying, or is going to lie. I have some people say that lying is the easiest sin one can break.