What's so hard to understand?
You have consciousness. You have a conscience. You have Free Will of thought. You know if something is right or wrong? I would think. And, I'm not talking about pushing the conscience aside for immoral ice cream snacks.
I'm talking about living life by our own conscience. If you are HONEST with yourself, then you'll live by it and let IT guide you. And, when your honest with yourself, then you'll more likely be honest in dealing with other people.
So, I don't get it- what's so hard to understand?