Although it may sound that way, and some dispensationalists probably have that mindset, in fairness I think that most do not really see it as, "God tried this and it didn't work." It would probably be more accurate to say that dispensationalists believe God put man under various administrations of His rule, each of which demonstrated man's failure to please God, or something to that effect. Also, many dispies today do not subscribe to the view of 7 dispensations. I've heard 4 from some.

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Mike Shingler
Pastor: Steep Hollow Baptist Church (SBC)
Bryan, TX