本於「信」而歸於「信」（evk pi,stewj eivj pi,stin）中的兩個「信」 （pi,stij）在過去的歷史中引起許多的討論和解釋。這些解釋可大略歸 納為四組，即把本於「信」而歸於「信」中的兩個「信」詮釋為：（1） 兩者皆指人的信心，（2）前者為基督的忠心，後者為人的信心，（3） 前者為基督的忠心，後者為人的相信，（4）前者為上帝的信實，後者 為人的信心。本文論述這四組不同的詮釋組合時，把它們簡寫為：（1） 人—人，（2）基督—人，（3）基督—人相信（4）上帝—人。 本文的主旨在於，從羅馬書的情境、經文的上下文和詞組關係來 分析羅1:17a 的本於「信」而歸於「信」中的兩個「信」。經由探討， 本於「信」而歸於「信」表達出「上帝自始至終是信實的」意義。羅 1:17a 可詮釋為：上帝自始至終的信實藉著福音揭露了上帝的拯救作 為。保羅以本於「信」歸於「信」來表達，上帝藉著福音彰顯了他的 拯救作為，而這樣的彰顯行動源自上帝自始至終信實的屬性，以對抗 猶太信徒對「上帝的話落了空」的疑惑，及反駁外邦信徒以為上帝棄 絕了猶太人的觀點。

In the past, there have been various discussions about and explanations of the meaning of “faith” (pi,stij) in the phrase “from faith to faith” (evk pi,stewj eivj pi,stin). Generally, the explanations can be divided into four groups: (1) human–human, (2) Christ–human, (3) Christ–human’s belief action, (4) God–human. The purpose of this article is, by using the context of Romans as well as the relationship of verses and syntagmatic relations, to analyze the two “faith” concepts in “from faith to faith” in Rom 1:17a. Following the analysis, this article comes to the conclusion that the meaning of both “faith” concepts can be expressed as “God’s faithfulness”, or a God–God explanation. According to this argument, the phrase “from faith to faith” can be explained as “God’s faithfulness is from the beginning to the end.” And thus Rom 1:17a can be translated as “God’s faithfulness is from the beginning to the end which reveals the saving action of God through the Gospel.” Paul uses this language to answer the question about God’s faithfulness among the believing Jews and Gentiles.