[6] brethren, if I come unto speaking with tongues, what shall I profit I shall speak either by revelation, or by knowledge, or by prophesying, or by doctrine? [7] And even things without life giving sound, whether pipe or harp, they give a distinction in the sounds, how shall it be known what is piped or harped? [8] For if the trumpet give an uncertain sound, who shall prepare himself to the battle? [9] So likewise ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for speak into the air.