For it has been granted to you that for the sake of Christ you should not only believe in him but also suffer for his sake (Phil. 1:29).
The phrase, "faith for faith," is taken directly from the translation of Rm. 1:17 by the English Standard Version, expressly, "For in it [that is, the Gospel] the righteousness of God is revealed from faith for faith." I say, "translation," but I mean more "interpretation" for, though the literal interpretation of the passage is "faith to faith," I am thinking (though I am unsure of this) that the translators of the ESV are picking up on part of what the apostle is doing with this phrase, namely using it as an inclusio to bracket with Rm. 3:21, 22 the section of the epistle from Rm. 1:18-3:20. [An "inclusio," is a literary device used to set apart a particular section of literature, bracketing it with common phrases.]
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