So--how does the requirement to keep God's commandments--- preclude what God did for us on the cross?This is where those in works righteous cults and heterodoxical churches really fail. They don't want to give up on trying to please God with their own works, whether temple works, praying the Rosary and doing penance, but trusting SOLELY ON Jesus Christ and what He did for us on the cross to save us.
1 John 2:3-4 ---King James Version (KJV)
3 And hereby we do know that we know him, if we keep his commandments.
4 He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.
Matthew 19:16-19--- King James Version (KJV)
16 And, behold, one came and said unto him, Good Master, what good thing shall I do, that I may have eternal life?
17 And he said unto him, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments.
18 He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,
19 Honour thy father and thy mother: and, Thou shalt love thy neighbour as thyself.
Revelation 22:14 --King James Version (KJV)
14 Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
John 14:15--- King James Version (KJV)
15 If ye love me, keep my commandments.
John 14:21--- King James Version (KJV)
21 He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.
1 John 5:2-3--- King James Version (KJV)
2 By this we know that we love the children of God, when we love God, and keep his commandments.
3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.
Is that what you refer to as "works righteousness"?