The law and the gospel

 Romans 2:12-16

All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law. 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. (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. 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.) This will take place on the day when God judges people’s secrets through Jesus Christ, as my gospel declares.

Those who do not have God's law and those who do will be judged, not by what they know but by what they do.

Why?

Judgment will according to what he has done, but not for what he knew. 

So the Jew knows the Lord could not save them, only the gospel can save them. It does not mean Jews have the law that is higher than others.

Everyone has consciousness in his heart, who knows what is right and what is wrong. so if anyone did the wrong who will be judged by his deed.

How?

Law is not the book, but it is written in our heart and remind us to do the right things.