It is OT law but it isn't about anyone keeping it perfectly.
Throughout the NT we see people called lawless... this isn't civil law, secular law... it is about following God's will. "Depart from me you workers of iniquity, I never knew you." Iniquity... anomia... without law...lawless. One not willing to follow God's instructions on how to walk out your life.
Again.. this isn't about being perfect, this is about an INTENT to be perfect... SEEKING righteousness. But we will falter from time to time... that is why Yeshua did what he did for us. Not to deliver us from God's commandments... but rather... to deliver us from our fallibility that ends in death.
I described it once like this, having a bow and arrow and aiming for and shooting at a target, and one person maybe saying, "well, if I can't hit the bullseye perfectly every single time I try, then I'm not even going to try or practice at it (righteousness) at all then..."
And how foolish is that...?
Now I understand people getting down or depressed or discouraged, but you can still at least practice right, and get back up, and get to where you can hit the target at least right, and with practice and with time and with trying to hit the bullseye, you will get better at it, and improve, right? But and/or also, even the very best of archers don't hit the bullseye all the time and every single time, or split their own arrows in the middle of the bullseye every single time...
No reason to just quit and not even try, and the "instructor" is not even basing your performance rating on how well, or not well you do or don't do, but just you willingness to not give up and just try, and get up and keep trying, aiming, practicing, etc... Not grading you on your performance, or comparing your performace to others performances, but just your willingness to not give up and not be a quitter, and your willingness to still keep trying, practicing, etc... Not about how good you do or don't do, or get to be, or don't get to be, etc... He knows how good you can or cannot be already anyway...
Not a perfect analogy i know, but it's pretty good...
God Bless!