The one who speaks in a tongue edifies himself, but the one who prophesies edifies the church.
Ὁ λαλῶν γλώσσῃ ἑαυτὸν οἰκοδομεῖ, ὁ δὲ προφητεύων ἐκκλησίαν οἰκοδομεῖ.