That's the eternal law. Pretty good description.
Therefore this formal declaration "Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world" only confirmed what they already had, they were already separated as sheep, and was not that of Jesus granting salvation at the judgment after His commandments were followed, since they already had salvation by faith, which their works testified to. Which is what sola fide teaches. Man is declared to be saved by faith, but the promise of salvation is also given to those who obey, since this confirms faith and justifies one as being an elect believer, but works are not the actual cause of salvation.
I doubt this'll sink in to one who has been prepared from birth to go on the MORMON 'mission' field when they are eligible to do so.