Romans 2:12-19 New Revised Standard Version (NRSV)
12 All who have sinned apart from the law will also perish apart from the law, and all who have sinned under the law will be judged by the law. 13 For it is not the hearers of the law who are righteous in God’s sight, but the doers of the law who will be justified. 14 When Gentiles, who do not possess the law, do instinctively what the law requires, these, though not having the law, are a law to themselves. 15 They show that what the law requires is written on their hearts, to which their own conscience also bears witness; and their conflicting thoughts will accuse or perhaps excuse them 16 on the day when, according to my gospel, God, through Jesus Christ, will judge the secret thoughts of all.
The Jews and the Law
17 But if you call yourself a Jew and rely on the law and boast of your relation to God 18 and know his will and determine what is best because you are instructed in the law, 19 and if you are sure that you are a guide to the blind, a light to those who are in darkness,