After reading Walk in the Spirit, Walk in Power, by Dave Roberson (which is the best study on tongues that I have ever read) I decided to pray in tongues every spare moment for as long as I could. I went for about a month. As a result, some very significant events happened:
I was contributing to the Prophetic Ministry thread on this forum and I gave over 200 prophetic words to people who asked for them. All but one of them were absolutely accurate, according to the feedback I got from those who received them. This was the most amazing thing I have ever experienced.
Also, I wrote two inspirational books - one on tongues, and another on where we stand with Christ. It seemed that the words for these books bubbled up from my spirit.
I also gained permanent employment after giving up Teaching, and in a job that satisfied me just as much and at a salary level that paid our bills, plus I got tutoring opportunities that supplemented our household accounts.
I also was accepted as a leader in the prophetic ministry group that I am involved with.
I gained a new appreciation of what Jesus did for me on the Cross, and the sense of the importance of concentrating on that in my preaching so that others may know where they stand with Christ.
I need to tell about the negative things that happened.
For the first time in the 40 years that I have been praying in tongues, I was attacked with severe doubts about it. It was a real spiritual battle, and I had to go back to the Word and really make sure that the gift of tongues was true and Scriptual, which it certainly is.
It showed me that the devil hates tongues and will do all he can to talk believers out of it.
Also, my teenage daughter has been attacked with bullying, unexplained abdominal pains, had her appendix and tonsils removed, had bouts of depression, and general sickness.
As the result of me making a mission of praying in tongues regularly, there have been these determined attacks of the enemy to distract me and derail my faith in the Lord,
So, I have come to the conclusion that using the gift of tongues raises a believer to a higher spiritual level and brings him to a place where he or she becomes a real threat to the devil.
So, we can expect real blessings, power, and effectiveness as we pray in tongues on a regular basis, but we can also expect attacks and battles as the enemy senses a threat to his kingdom through our effectiveness with God in the spiritual realm.
But we need not be afraid. The Word says that 'no weapon formed against us can prosper". Let the devil do all he wants, he cannot win because he is already a defeated foe.