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averagefellar said:
One serious dilemma your friends creates is an open canon. If prophecy has not ceased, scripture may still be open and Sola Scriptura is false. To be a Christian, you have to uphold a closed, completed canon.......which means that prophecy has ceased.
what if they say it's supplemental or otherwise... make something up?

Romans 8:29 (in Arminian): For whom He foreknew, He also [foreknew] to be conformed to the image of His Son, that He might be the firstborn among many brethren.