John Chrysostom
"Yet in church I would rather speak five words with my mind, that I may instruct others also" (1 Cor 14:19). What does it mean "to speak with my mind, that I may instruct others also"? It means to speak what I understand, what I can interpret to others, to speak with awareness and instruct the hearers. "Than ten thousand words in a tongue." Why? "That I may instruct others also," he says. The first gives only apparent glory, but the latter gives great benefit. Everywhere he seeks one thing: the common benefit. Although the gift of tongues was extraordinary, while the gift of prophecy was ordinary, ancient, and already belonged to many, Paul did not consider it very desirable for himself. Tongues had then become known for the first time.
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Yet he did not even use this gift, not because he lacked it, but because he sought what was more profitable. He was free from all vainglory and had only one aim: how to make his hearers better. He could see what was profitable both for himself and for others because he was free from vainglory. But one who enslaves himself to this passion cannot see what is profitable, not only for others, but even for himself. Such was Simon, who, being guided by vainglory, did not see what was profitable even for himself (Acts 8). Such also were the Jews, who for the same reason betrayed their own salvation to the devil.