In the Hebrew text of Habakkuk, God’s answer to the prophet is an exhortation to keep the faith: “The righteous one shall live by his faithfulness,” that is, the person who remains faithful will be rewarded in the end by God. The LXX, however, has reinterpreted the dictum as a promise about the character of God: “The righteous one shall live by my faithfulness,” that is, God’s own integrity in preserving the covenant with Israel will ultimately be confirmed. As Paul allows the quotation to reverberate into the text of Romans he elides the crucial personal pronoun, so that we hear only “the righteous one shall live by faithfulness.” Whose faithfulness? We are not told. The ambiguity thus created allows the echoed oracle to serve simultaneously as a warrant for two different claims that Paul has made in his keynote formulation of the gospel: in the gospel God’s own righteousness is revealed; and the gospel is the power of God for salvation to everyone who believes.