In 1 Corinthians 14:24-25, Paul stressed the superiority of prophesying (as in the preaching of truth) over speaking in tongues, especially for the unbeliever. According to 1 Corinthians 14:3, prophesying is for edification, exhortation, and comfort. Therefore, Paul in this chapter is dealing with the aspects of prophesying that perfectly match Bible preaching today. When the unbeliever hears such preaching, "he is convinced of all, he is judged of all: And thus are the secrets of his heart made manifest" (v.24-25). This is the purpose of true preaching for the unbeliever. The word, convince, is related to the word convict. Jesus asked those opposing Him, "Which of you convinceth me of sin?" (John 8:46). The preaching of the word should convince the sinners, bring the sinners into judgment, and reveal the secrets of their hearts. Does your preaching do this? Does the preaching you listen to do this? When the unbeliever is so convinced, "falling down on his face he will worship God, and report that God is in you of a truth" (1 Corinthians 14:25). May we see once again the power of such preaching in our churches.
