The commandments are still the same, but now they are seen in an entirely different light because of the change in our relationship with the lawgiver. Now we are able to obey not just in letter but in spirit and from the heart, and we know that the law is holy, and just, and good.
Doesn’t the believer still find the commandments grievous at times? Yes, because the old nature still remains in him and rises up to cause resentment. Paul describes the complex experience of the believer in which he wills to do what is right according to the law but ends up doing the opposite (Romans 7:14-25). Sin deceives him and makes him do what he does not intend to do. It is therefore no longer the man himself that does evil but sin working in him; Scripture gives us warrant to see it this way. At such times the old nature finds the commandments grievous, but the new nature rejoices in them and prevails over the old, putting it to death.