I think Red would be referring to Romans 2
"13 For it is not those who hear the law who are righteous in God’s sight, but it is those who obey the law who will be declared righteous. 14 (Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law. 15 They show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts sometimes accusing them and at other times even defending them.)"
The question personally is a strange one, but God's law is written in the very fabric of our being and we need to respond in obedience that springs forth from faith as it says in Romans 1
" 1 Paul, a servant of Christ Jesus, called to be an apostle and set apart for the gospel of God— 2 the gospel he promised beforehand through his prophets in the Holy Scriptures 3 regarding his Son, who as to his earthly life was a descendant of David, 4 and who through the Spirit of holiness was appointed the Son of God in power by his resurrection from the dead: Jesus Christ our Lord. 5 Through him we received grace and apostleship to call all the Gentiles to the obedience that comes from faith for his name’s sake. 6 And you also are among those Gentiles who are called to belong to Jesus Christ."
Good quotes
Yes, it is not those who hear the written law that is written down that are righteous, but those who obey that law.
The Israelites had the law, but they were a stiff necked people. God knew they would soon desert him once they reached the promised land. He had told Moses this. Their history under judges and kings was mostly rebel against God, get into a mess, need his help, cry out to him, he rescued them and they deserted his ways again. So the written law itself did not keep them with God or bring holiness because in their hearts they did not love God and truly want to be obediant in their hearts.
Under the old covenant God told Moses to tell the people to circumcise their hearts, Deut 10:16, but the new covenant is very different
And circumcision is circumcision of the heart by the spirit, NOT BY THE WRITTEN CODE
Rom 2:29
And under the new covenant
This is the covenant I will make with them after that time says the Lord
I will put my laws in their hearts and write them on their minds
Then he adds
Their sins and lawless acts I will remember no more
Heb 10:16&17
I love the way the living Bible puts it concerning God's good laws being written on our hearts and minds
'This means that in our heart we WANT to live as God would have us live, unlike the Israelites who mostly did not.
So if we want to live as God would have us live because his good laws are written on our hearts and minds, we do not need to look to the written law and strive to obey it, but as your quote of Paul says, our obediance to what God desires comes from faith,
So it is not for us to look to the written law, but to Christ and trust him to change us into what he would have us be, and to bring us to live according to how God would have us live
Then the glory is God's
But for those who look to the written law itself and strive to obey it, this can never be fully true