1 Corinthians 14:25 - Ellicott's Commentary On The Whole Bible

And thus are the secrets of his heart made manifest. — Better, and the secrets of his heart are made manifest — such being the reading of the best MSS. It is the third result of the prophetic utterances explained in previous Note. His complete conversion is evidenced by his worshipping God and recognising the presence of God in that assembly of Christians: “He will confess that you are not mad, but that God is truly in you, and that He is the true God who is in you” (Bengel). It is to be noticed that though the Apostle speaks in this passage of an “unlearned” person (i.e., a private person, one who has no gift of prophecy or tongues), or an “unbeliever,” it is the latter that is most prominently before his mind, and the former only so far as he shared in common with the latter his ignorance and inability to understand.