Otherwise, if you speak a blessing in spirit, how can someone who is uninstructed say “Amen” to your thanksgiving, since he does not know what you are saying?
Textus Receptus (TR) - 1 Corinthians 14:16 >Ἐπεὶ ἐὰν εὐλογήσῃς τῷ πνεύματι, ὁ ἀναπληρῶν τὸν τόπον τοῦ ἰδιώτου πῶς ἐρεῖ τὸ Ἀμὴν ἐπὶ τῇ σῇ εὐχαριστίᾳ, ἐπειδὴ τί λέγεις οὐκ οἶδε;