Romans 2:17

"Behold, thou art called a Jew, and restest in the Law, and makest thy boast of God, and knowest His will, and approvest the things that are more excellent, being instructed out of the Law." After saying that the Gentile wanteth nothing appertaining to salvation if he be a doer of the Law, and after making that wonderful comparison, he goes on to set down the glories of the Jews, owing to which they thought scorn of the Gentiles: and first the very name itself, which was of great majesty, as the name Christian is now. For even then the distinction which the appellation made was great. And so he begins from this, and see how he takes it down. For he does not say, Behold, thou art a Jew, but "art called" so, "and makest thy boast in God;" that is, as being loved by Him, and honored above all other men. And here he seems to me to be gently mocking their unreasonableness, and great madness after glory, because they misused this gift not to their own salvation, but to set themselves up against the rest of mankind, and to despise them. "And knowest His will, and approvest the things that are more excellent." Indeed this is a disadvantage, if without working: yet still it seemed to be an advantage, and so he states it with accuracy. For he does not say, thou doest, but knowest; and approvest, not followest and doest.