Sha'ul (Paul) shows his compassion for his people, the Jewish people, that they will look to Yeshua.
Sha'ul said the following about himself.
Philippians 3:5 circumcised the eighth day, of the nation of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; as to the Law, a Pharisee;
Romans 10:1-4 Brethren, my heart's desire and my prayer to G-d for them is for their salvation. For I bear them witness that they have a zeal for G-d, but not in accordance with knowledge. For not knowing about G-d's righteousness, and seeking to establish their own, they did not subject themselves to the righteousness of G-d. For Messiah (Christ) is the end of the law for righteousness to everyone who believes.
"Yeshua is the end of the law" means Yeshua, himself, was the goal of the law. (Instruction) It's showed we need Him. As believer's only we have died in Yeshua HaMashiach and are now married to Him. We need a perfect redeemer. He was the only on who could fulfill the law (instruction) for us to make available eternal redemption.
G-d is not a respecter of persons. He only cares about a heart searching for Him (like David's). It does not matter if you are Jewish or Gentile.
Romans 10:5 For Moshe (Moses) writes that the man who practices the righteousness which is based on law shall live by that righteousness.
Granted that you could keep from breaking it, it would be your own righteousness not G-d's righteousness.
Mattityahu (Matthew) 6:24 No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. You cannot serve G-d and mammon.
Romans 10:6-8 But the righteousness based on faith speaks thus, "Do not say in your heart, 'Who will ascend into heaven?' (that is, to bring Messiah (Christ) down), or' Who will descend into the abyss?' (that is, to bring Messiah (Christ) up from the dead). " But what does it say? "The word is near you, in your mouth and in your heart"-- that is, the word of faith which we are preaching,
Paul is referring to the following passage.
D'varim (Deuteronomy) 30:11-14 "For this commandment which I command you today is not too difficult for you, nor is it out of reach. It is not in heaven, that you should say, 'Who will go up to heaven for us to get it for us and make us hear it, that we may observe it?' "Nor is it beyond the sea, that you should say, 'Who will cross the sea for us to get it for us and make us hear it, that we may observe it?' "But the word is very near you, in your mouth and in your heart, that you may observe it.
We do not have to look for the righteousness that Sha'ul (Paul) is speaking about. It is available right where you are sitting.
Romans 10:9 that if you confess with your mouth Yeshua (Jesus) as L-rd, and believe in your heart that G-d raised Him from the dead, you shall be saved; for with the heart man believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation. For the Scripture says, "Whoever believes in Him will not be disappointed."
Sha'ul (Paul) referring to the following passage.
Yesha'yahu (Isaiah) 28:16: Therefore thus says the L-rd G-D, "Behold, I am laying in Zion a stone, a tested stone, a costly cornerstone for the foundation, firmly placed. He who believes in it will not be disturbed.
Paul states this to show his previous statement "by faith righteousness" is taught in other Tanakh passages. It is universal. Paul says "whosoever"!!
Eternal Salvation is offered to "all" on the basis of mercy - by faith.