SOME ANSWERS

vv. 6-15 = Love God....vv. 16-21 = Love your neighbor ...

As for the other questions:

No. One cannot gain righteousness by following the 10 Commandments. Righteousness is by grace alone. If one does attempt to be righteous by following the 10 commandments one is focusing on words and deeds and not God (and therefore is automatically breaking the first Commandment).

And finally...I say that if one focuses, instead, upon Loving God and Loving one's neighbor, one will automatically find one's self coming into alignment with the 10 Commandments (and then some). I believe that God's will supersedes God's Law. The latter is an outcome of the former. God's Will has been in place from the beginning of time.