1 Corinthians 14:12

So also ye, since ye are zealous of spiritual gifts, seek that ye may abound unto the edifying of the church. [If there be any place where sound without sense is apparently valuable, or profitable, argues Paul, it will be found in the use of musical instruments. But even here there are laws of cadence, modulation, harmony, etc., which form a veritable grammar of tongue-language, which, when obeyed, give to music what we may call a tone-sense, analogous to the intellectual sense embodied in language. Hence one may play an instrument so as to make it meaningless, and if he does he makes it profitless. Moreover, some instruments, such as the trumpet, because of the fixed and established laws of tone, are used to convey a language as well defined and unmistakable as that of the voice. Thus certain notes on the trumpet command a charge, others the joining of battle, and yet others the retreat, etc. Now, if the trumpet or trumpeter fails to produce this tone-language intelligibly, the army is thrown into confusion. Spiritual guidance uttered in an unknown tongue was like a blare of the trumpet which gave no order. Both disappointed the expectation of the listener. Both spoke idly into the air, instead of profitably into the ear. There are many sounds in the world, but they only become voices when they convey some form of sense. Thus we speak properly enough of the "voice of the trumpet," when it is blown, but no one speaks of the voice of the boiler when it is being riveted. Sense, meaning, signification, are the very essence of voice--the qualities which distinguish it from mere sound. If you use your voice to speak a foreign, and hence a meaningless, language, you degrade it, so that to your hearer it becomes a mere profitless sound. This you should not do. Since you earnestly seek gifts, you should seek them for practical purposes; viz.: for the abundant edification of the church.]