@androb31
Yeah that was my experience. I was actually assigned a number 4 talk on the Holy Spirit shortly before my being DF'd. At the time I was really looking at the Bible with fresh eyes and it impacted me how little I knew about the Holy Spirit. What did we really know? When someone was sick or going through a trial we might pray for an "extra portion of the Holy Spirit" go to them -- but really what did we expect it to do? -- maybe give them strength to endure or something? After leaving the WT religion I learned more about the Holy Spirit. Not necessarily through study but through different experiences and such.
@chalam
I was looking at that verse you put from Matthew. I'm not going to argue that there aren't counterfeit miracles and also deceiving spirits. It does seem though that this verse is talking more about the character of the individual and not the legitimacy of the work done in Jesus' name. If a wicked man uses the name of Jesus to cast out a demon, well I think that speaks more for the power of Jesus' name than the quality of the individual using it. Another thing that comes into play here is the faith of the individual receiving the miracle. Their heart may be in a good place while the one "working" the miracle might be full of deceipt and wickedness.