Morals are ENTIRELY SUBJECTIVE.
There are NO natural/God-given laws.
When you establish a government (ie a Leviathan) you agree on concepts that MOST of the people feel are right, wrong, should be legal, illegal, etc. But that's a synthetic morality... it's totally up to you on a personal level, and up to the state on a government level (ex. If you kill someone because you believe it's right, then you may feel whatever you want, morally or otherwise, but as murder is outlawed, it will be deemed wrong in that sense, as you committed the crime in a place where that action was prohibited, and by living there you agreed to abide by that law.)