From the Facebook Group Reformed Charismatics. On rejecting cessationism:
***the bible never calls the gifts “sign gifts”. Rather, it calls them “charismata”, or quite literally “grace gifts”. This alone shatters the cessationist position that the gifts were only meant to be temporary “signs” until the cannon was complete.
Also, the fact that the bible commands us to “eagerly desire” the charismata, and even goes so far the equate “despising prophecy” with quenching the spirit. The fact that the church in Corinth was abusing the gifts and yet Paul never rebukes them for practicing the gifts, or mentions them ceasing. Rather, he corrects their usage of the gifts and then encourages them to continue in the practice of them.
Also, the fact that there are multiple cases in the bible itself which gives examples of people prophecying and yet, none of the prophecies are written in scripture, thus detrying the “all prophecy is equal to scripture” fallacy. For cessationists to be consistent they would need to somehow dig up all the prophecies which are spoken of in the bible, but not recorded in the bible, and add them to the cannon.
*** Paul’s body dynamic argument in 1 Corinthians 12, that all the members of the body are necessary.
***The “perfect” never refers to the canon.
Logical Investigations 