To strengthen his argument, Paul offers an illustration from the world of music. The person who speaks unintelligible sounds in the worship service is compared to a flute (or pipe
) or a harp that does not produce distinct notes. Such an instrument cannot fulfil its purpose, that of making pleasing melodies.
7 If even lifeless instruments, such as the flute or the harp, do not give distinct notes, how will anyone know what is played?