In Romans 1:17, what does Paul mean by “from faith to faith” (ἐκ πίστεως εἰς πίστιν)?

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¹⁷ For in it the righteousness of God is revealed from faith to faith; as it is written, “But the righteous man shall live by faith.” ^{NASB, ©1995}

^ΙΖʹ δικαιοσύνη γὰρ θεοῦ ἐν αὐτῷ ἀποκαλύπτεται ἐκ πίστεως εἰς πίστιν, καθὼς γέγραπται· ὁ δὲ δίκαιος ἐκ πίστεως ζήσεται. ^{NA28, ©2012}

When I read “from faith to faith,” I thought it was a temporal statement (i.e. from law to grace—the faith once delivered). But I have read three commentaries on Romans (not just for this question but just in general because it is my favorite epistle), and no one so far has mentioned that it is a temporal statement. Am I totally off the mark? Could there be no transitional temporal meaning to the phrase “from faith to faith?”