In Romans 2, Paul writes about the “law” being written on the heart of the Gentile:
13for it is not the hearers of the Law who are just before God, but the doers of the Law will be justified. 14For when Gentiles who do not have the Law do instinctively the things of the Law, these, not having the Law, are a law to themselves, 15in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them, 16on the day when, according to my gospel, God will judge the secrets of men through Christ Jesus.
Although this text is widely seen as suggesting that God’s “law” is written on the hearts of Gentile human beings in general, Paul here is instead describing the writing of the “law” on the hearts of believers (and in this context, specifically Gentile believers). For reasons spelled out in detail elsewhere, the word “instinctively” is arguably a misleading translation – a better translation of the relevant fragment of verse 14 would be:
“when Gentiles who do not have the Law by birth, do the things of the Law….
Note how Jeremiah, uses very same “law written on the heart” concept:
But this is the covenant which I will make with the house of Israel after those days," declares the LORD, "I will put My law within them and on their heart I will write it; and I will be their God, and they shall be My people
Note how the prophet uses “law written on the heart” language to describe something that will happen in the future and will which will be effective only for believers.
Note also this famous text from Deuteronomy 30:
Now what I am commanding you today is not too difficult for you or beyond your reach. 12 It is not up in heaven, so that you have to ask, “Who will ascend into heaven to get it and proclaim it to us so we may obey it?” 13 Nor is it beyond the sea, so that you have to ask, “Who will cross the sea to get it and proclaim it to us so we may obey it?” 14 No, the word is very near you; it is in your mouth and in your heart so you may obey it.See, I set before you today life and prosperity, death and destruction. 16 For I command you today to love the LORD your God, to walk in obedience to him, and to keep his commands, decrees and laws; then you will live and increase, and the LORD your God will bless you in the land you are entering to possess
This is the very same text that Paul directly quotes in Romans 10 in relation to matters of law – so let’s not pretend Paul does not have the Deuteronomy text in mind as he dictates his letter to the church at Rome. This Deuteronomy text is smack-dab in the middle of a treatment of God’s promised future renewal of his covenant with Israel. So to the extent that we believe that Jesus’ work comprises the renewal of the covenant (and while I think that this is so, there is no space to argue for it in this post), this text is fulfilled for the Jew + Gentile church, and not just the nation of Israel
precisely because the church is the “true Israel”.
What is the point of all this? In both the Jeremiah text and the Deuteronomy text, we have images of the “law” being written on the heart of the believer, enabling obedience to that law.
Paul is deeply knowledgeable of Old Testament concepts and would more likely than use “law written on the heart” language in the same way it was used in the Old Testament. Therefore, it is most reasonable to conclude that Paul does indeed believe that this “law written on the heart” can indeed be obeyed.
To be frank, the only reason why the position of Dr. Walter has so much traction, and is so widely accepted, is Old Testament ignorance. Once we see that Paul is picking up a covenant renewal theme, from texts like Jeremiah, Deuteronomy and indeed others, we need to take that seriously. And when we do, we realize that Paul is connecting into a theme whereby God indeed makes it possible for people to obey such a law. Dr. Walter’s position requires us to see obedience as “impossible”. Yet that is clearly not Paul’s intent, unless it is an incredible co-incidence that Paul uses the language of law written on the heart in a manner entirely inconsistent with its Old Testament use – where the believer (at the time of covenant renewal) is indeed enabled to obey the law.
Not at likely for a Biblically literate Pharisee like Saul of Tarsus.