XVI. On which account we have been compelled to have recourse to such signs as are given by the voices, that is nouns and verbs, which ought by all means to be universally known, in order that our neighbours might clearly and evidently comprehend our meaning; and, in the next place, to utter them at all times with truth. (121) For of what advantage would it be to make our assertions clear and distinct, but nevertheless false? For it follows inevitably that if this were allowed the hearer would be deceived, and would reap the greatest possible injury with ignorance and delusion. For what would be the advantage of my speaking to a boy distinctly and clearly, and telling him, when I show him the letter A, that it is G, or that the letter E is O? Or what would be the good of a musician pointing out to a pupil whom comes to him to learn the rudiments of his art that the harmonic scale was the chromatic; or the chromatic, the diatonic; or that the highest string was the middle one; or that conjoined sounds were separated; or that the highest tone in the tetrachord scale was a supernumerary note? (122) No doubt, a man who said this might speak clearly and distinctly, but he would not be speaking truly, but by such assertions he would be implanting wickedness in language. But when he joins both distinctness and truth, then he makes his language profitable to him who is seeking information, employing both its virtues, which in fact are nearly the only ones of which language is capable.