What does it mean that 'cursed is he who does not confirm all the words of this law to do them'?

Les teaches that this curse means if you do not keep every last jot and tittle of the Law—as no man can do, and only God can do—you are under the curse of God. He warns that when a person says they will keep the Law to merit favor with God, there is no way any mortal man can do it, so they put themselves under the curse. Deuteronomy 27 declares, "cursed be he that confirmeth not all the words of this law to do them." Paul in Galatians 3 makes the same reference: "as many are on the works of the Law unto the curse; for it is written, Cursed is every one that continueth not in all things which are written in the book of the Law to do them." Les emphasizes that this is a tremendous warning: don't try to put yourself under the Law, since you're human and cannot keep it anyway. When you put yourself under a so-called legal system, you are actually putting yourself under the curse of God. It's serious business and serious language—not his, but the Book.