John Wesley on 1 Corinthians 14:23

Yet - Sometimes prophecy is of more use, even to unbelievers, than speaking with tongues. For instance: If the whole church be met together - On some extraordinary occasion. It is probable, in so large a city, they ordinarily met in several places. And there come in ignorant persons - Men of learning might have understood the tongues in which they spoke. It is observable, St. Paul says here, ignorant persons or unbelievers; but in the next verse, an unbeliever or an ignorant person. Several bad men met together hinder each other by evil discourse. Single persons are more easily gained.