Most Christians have a difficult time distinguishing their spirit from their intellect. Your conscience is the voice of your spirit. The Holy Spirit is more closely associated with your conscience than your intellect. As you pray in tongues, you are praying from the channel of your conscience through which the Holy Spirit speaks.
Our problem is that we are more accustomed to looking for God’s voice in our intellect. Our intellect is generally an unsafe guide because it is usually clouded with a mixture of the world’s thinking, where much of our decision-making is based on our best interests. Most Christians have a difficult time hearing from God, because their soul which comprises much of their intellect, is clouded with self, mingled with the world and yet has some Word in it.
— Bert Farias, Charisma News, Why Every Preacher Should Embrace Praying in Tongues, January 31, 2017