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We would agree with the author that "God told me" is problematic, but not for the same reasons. We take issue because the statement is a conversation-ender. He takes issue with it because he's a cessationist and doesn't believe the gift of prophecy or any other sort of "supernatural" manifestation is available for the contemporary Christian.
We think the prophetic spiritual gift is or should be in operation today, because we live in the "last days" (He. 1:2), where the Holy Spirit is poured out and our sons and daughters prophesy (Acts 2:17). As to how that should manifest we leave that discussion to church leadership.
The bottom line here is that the author expects every revelation from God is Prophecy with a capital "P." And for unexplained reasons, every revelation must be confirmed by signs and wonders. We long for the author to make a biblical case for these astounding claims, but alas, the author manages to quote but a single ancillary Scripture.
We must regard this as Bad Bible Teaching.
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