You've heard it said that we are no longer under the Law,
meaning the Law given to Moses by God on Horeb. But the Law which God requires
of all mankind is the Law of Righteousness. Therefore, St. Paul says that those
who do what is in the Law (of Moses) fulfilling the requirements of
righteousness (which is the Law which Abraham was under. Namely, to walk before
the Lord perfectly), without being under the Law are a law unto themselves.
Wicked and deceived people go around trying as they may to conflate the Mosaic
Law and the Law of Righteousness which was given through Christ, so that by
having been excused by God from the Law they might excuse themselves from
righteousness. These people are lawless, and they never stop making excuses for
their wickedness. They live without the natural restraint which comes from
living righteously. They reject righteousness for what they call liberty, when
it is liberty which is given by Christ to His people so that they can be
righteous. This is the lawlessness I was speaking of.
"Every art and every inquiry, and similarly every action and choice, is thought to aim at some good; and for this reason the good has rightly been declared to be that at which all things aim." ~Aristotle~