True obedience was doing that which is good and right in his sight, by doing what LORD asks.
There is a tremendous difference between the Law and Word, for one the term 'Word' has four letters while the term 'Law' has three letters.
So what curse did the Law bring that the Word doesn't bring?
15 Cursed be the man that maketh any graven or molten image, an abomination unto the LORD, the work of the hands of the craftsman, and putteth it in a secret place. And all the people shall answer and say, Amen.
16 Cursed be he that setteth light by his father or his mother. And all the people shall say, Amen.
17 Cursed be he that removeth his neighbour's landmark. And all the people shall say, Amen.
18 Cursed be he that maketh the blind to wander out of the way. And all the people shall say, Amen.
19 Cursed be he that perverteth the judgment of the stranger, fatherless, and widow. And all the people shall say, Amen.
20 Cursed be he that lieth with his father's wife; because he uncovereth his father's skirt. And all the people shall say, Amen.
21 Cursed be he that lieth with any manner of beast. And all the people shall say, Amen.
22 Cursed be he that lieth with his sister, the daughter of his father, or the daughter of his mother. And all the people shall say, Amen.
23 Cursed be he that lieth with his mother in law. And all the people shall say, Amen.
24 Cursed be he that smiteth his neighbour secretly. And all the people shall say, Amen.
25 Cursed be he that taketh reward to slay an innocent person. And all the people shall say, Amen.
26 Cursed be he that confirmeth not all the words of this law to do them. And all the people shall say, Amen.
Deut 27:15-26
As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed. Gal 1:9