So then if I claim God told me that all garbage service in my state will fail in the month of June - and I also claim that God said the Trinity doctrine is false - you would wait to see what happens with the garbage service next month and depending on what happened you would re-evaluate your belief on the Trinity?
What Bible text leads you to select that particular method?
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My point is that offering a reasonable solution to a technicality like "was Jonah a false prophet since Nineveh was not destroyed in 40 days" -- is very different from "did God really tell someone the Trinity is a false doctrine".
Gal 1: 6 I am amazed that you are so quickly deserting Him who called you by the grace of Christ, for a different gospel, 7 which is not just another account; but there are some who are disturbing you and want to distort the gospel of Christ. 8 But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!
Paul does not say that the doctrinal test can be put on hold depending on how the prediction about sanitation services pans out.
I think I failed to make myself clear. There are limits to the extent valid prophecy could affect my beliefs.
The doctrinal test is based on the apostolic faith. We do not precisely know, because scripture can be interpreted in different ways, what the apostolic faith was on certain issues. On other issues, we can be absolutely certain because of the Patristic record and the Ecumenical Councils.
However, regarding one of the points of uncertainty, for example, Calvinism vs. Arminianism, if an inspired prophet appeared and prophesied correctly in a manner that met the standards that was not in my particular camp, but still within the realm of apostolic faith, I would consider that I was in the wrong camp. To a certain extent, the existence of obviously inspired prophets in some of the Eastern churches and other examples of the miraculous, have convinced me of the need to break out of the endless infighting of Reformed theology (specifically, Federal Vision theology and the controversy surrounding it, which I had an interest in), and immerse myself more in the mystical theology of the Eastern churches.
Now, in the case of Ellen White, I am in a bit of a pickle because other than her support of the Trinity, I find myself disagreeing with most of what she said. I don’t believe her soteriology is compatible with the Pauline epistles, and in other places it seems to me that she is at war with the early church based on the false dichotomy of Roman Catholicism vs. Protestantism, and this leads to the historical errors in The Great Controversy I mentioned earlier. If her soteriology was more Pauline and more sola fide, and if her works like The Great Controversy did not have the errors that they have, and if she engaged with the pre-Nicene fathers and took the logically consistent step of embracing the council of Nicea, which defended against the anti-Trinitarian heresy of Arianism, and if her timeline made more sense, an if she did not adhere to an eschatology we can’t even discuss except in Controversial Christian Theology, I could conceivably accept her idea on the Investigative Judgement, which is strange, but frankly, the concepts used by mystical theologians to explain the Last Judgement often are strange and frightening, moreso in Eastern Christianity than in Western Christianity.