Else when thou shalt bless with the spirit, how shall he that occupieth the room of the unlearned say Amen at thy giving of thanks, seeing he understandeth not what thou sayest? He that occupieth the room of the unlearned - One who is not acquainted with the language in which you speak, sing, or pray.
Say Amen - Give his assent and ratification to what he does not understand. It was very frequent in primitive times to express their approbation in the public assemblies by Amen. This practice, soberly and piously conducted, might still be of great use in the Church of Christ.
This response was of the highest authority and merit among the Jews; they even promised the remission of all sins, the annihilation of the sentence of damnation, and the opening of the gates of paradise, to those who fervently say Amen. And it is one of their maxims that "greater is he who says Amen than he who prays." See many testimonies of this kind in Schoettgen. Now, allowing that this was of so much consequence in the time of St. Paul, it was a very serious matter for a person to be in a congregation where prayer was offered, who could not say Amen, because the prayers were in a language which he did not understand.