Every time the Holy Spirit falls on an individual in the New Testament, a gift of the Holy Spirit manifests and gives evidence that they have received the infilling of the Spirit. In the New Testament, they usually spoke in tongues or prophesied or both.
One of the first things that happened when the baptism of the Holy Spirit first came was that, all the people who were in that upper room, spoke with tongues.
Acts 2:4 – And they were filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.
Consistently, all through the book of Acts, there was a manifestation of God’s presence when the people received the Holy Spirit. Speaking in tongues is only one benefit. So many ask why do I need to speak in this unknown language? Well, for one thing, Satan won’t understand what you are saying to God. Another reason is, “How many ways can you pray that someone is healed?” “Lord, please heal them” is pretty much it. But the Bible says the Spirit will give us the words when the Spirit prays.
First let me ask the doubters this: Why would God include the gift of speaking in tongues as one of the nine gifts, if it wasn’t to improve our lives? When you first begin to pray in tongues, your mind will tell you, “This is crazy, it makes no sense.” It takes faith to pray in tongues, which is the reason Jude 20 says for us to build ourselves up in your most holy faith. It takes you out of natural thinking and reasoning and puts you into a supernatural realm of faith.
When we pray in tongues, we pray with wisdom that goes beyond our mental ability. Our spirit that knows all things and has the mind of Christ, will begin to pray for people in ways we could never do with our own understanding.
When we pray in tongues, it’s our spirit praying. Our spirit has the mind of Christ, and knows exactly what and whom to pray for. It is an “unction” from God so that we know all things and there is no limitation to our spirit.
In 1 Corinthians 14:13, it says to pray that you can interpret. That doesn’t mean you have to stop praying in tongues and pray in English to interpret; it means your understanding becomes fruitful.
Giving a message in tongues in a church service is different though. After speaking in tongues, you need to interpret in English or whatever language is in your church setting. But when praying by yourself or in private, God will give you a revelation, or a different outlook on the situation. It may not come all at once though.
Praying in tongues is a way to communicate directly from your heart to the Father, bypassing your brain with its doubts and fears. It builds us up in our most holy faith and releases the hidden wisdom of God. God never gives us something that we should be afraid of.