Prophesying & Speaking in Unknown Tongues

I Corinthians 14:23-25

23  If therefore the whole church be come together into one place, and all speak with tongues, and there come in those that are unlearned, or unbelievers, will they not say that ye are mad? 
24  But if all prophesy, and there come in one that believeth not, or one unlearned, he is convinced of all, he is judged of all: 
25  And thus are the secrets of his heart made manifest; and so falling down on his face he will worship God, and report that God is in you of a truth.