That is why the church should worship in the old way, in the traditional way, which we believe to be the Biblical way, with reverence and understanding. Yes, the heart must be in it, but you must worship so that you can understand the words; not with deafening instruments, shattering sounds, worldly music, crooning and notes sliding about all over the place, words that make little sense. It must be plain and intelligent and meaningful to us, so that we can understand it. Understanding is everything.
To charismatic believers these words teach that one may pray in tongues (in spirit) even though the understanding is blank. But this is out of the question for the believer, because the mind is always involved in spiritual activities. Paul says most emphatically – ‘I shall pray with the spirit, and I shall pray with the understand [with the mind] also.’ The situation he proposed hypothetically is not legitimate. Most definitely they should not even attempt to pray in that way, or sing in that way.