I think that Kim Riddlebarger, in his article A Present or Future Millennium?, although speaking specifically of "eschatology" as the subject, gives a brief but cogent definition of the "Analogy of Faith" which hopefully will suffice.

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All of the Protestant Reformers, were they to come back to give us counsel in these areas, would insist that we must start with the notion that the Bible itself must be read with the analogia fidei (the analogy of faith), meaning that Holy Scripture must be allowed to interpret Scripture. In other words, we must inductively develop a biblical model of eschatology by utilizing all of the passages that relate to the return of Christ, the resurrection, the judgement, the millennium, and so on. We should never study eschatology merely by finding Bible verses (often out of context) that we think describe current events. And so, by utilizing the analogy of faith, we begin with the clear declarations of Scripture regarding the coming of our Lord and use them to shed light on passages that are less clear.
In essence a "Systematic Theology" is the fruit of the "Analogy of Faith". <img src="/forum/images/graemlins/wink.gif" alt="" />

In His Grace,


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simul iustus et peccator

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