Deuteronomy 30 outlines the summary of blessings and cursings for obedience and rebellion to His commandments, respectively, and makes it clear to us that they are "not too difficult" for us. Yeshua, in addition to His observation that not "one yod or tiddle" would pass from His Torah until "heaven and earth" pass -- which clearly has NOT occurred! -- also made the simple request that "If you love Me, keep My commands." Seems to me that my "reasonable service" is to obey my Master, King, and Kinsman-Redeemer. Not because I expect to "earn salvation" by being "under" anything (except His authority) - but because of what He has already done, and because I do love Him.
This is the heart of the matter in an nutshell -- we no longer keep the law out of obligation and fear of punishment -- Jesus paid the full price of all sin -- but, now we keep the law (that has been written on our hearts instead of a tablet of stone) "because of what He has already done" and because we love Him! We do not have to walk in "fear" because when we do "mess up" - even those sins have already been paid for - we only need to repent and get back up and keep going.
Paul said that in the past the law was a harsh schoolmaster -- that's sort of like when our kids are toddlers and we are harsh with them about things like not running across the street. They do not run across the street then - not because they have any kind of understanding about what could happen to them - but, only because they are afraid of the punishment that will follow if they do so! That's what the law USED to be like -- the people did not - and could not have any kind of spiritual understanding becasue Jesus had not yet come and they did not have the Holy Spirit within them which gives spiritual insight. So, because God had to deal with them on their level of natural understanding - everything had to be spelled out for them, including the "curses" that would follow if they did not keep His instruction.
For us to obey the law now, then - out of the fear of the curses of not keeping it - would be like that toddler to now be a grown man - and to run across the street one day without remembering to look both ways - and then begging everyone to not "tell" on him because of fear he would be punished. When we have accepted the gift of salvation by grace through faith in Jesus, we have the Holy Spirit - and are then motivated (or should be motivated) by LOVE. Just like Paul, then, we understand that although "all things are lawful, all does not edify".
Don & Shari
PS: Remember I Cor 13 -- No matter what we do - if we are not doing it in Love - it is pretty much meaningless.......... (of all that remains - the greatest is Love)