Philo Judaeus Quod Deterius Potiori Insidiari Soleat 38

And it is on this account, as you see, that Moses rejected the sophists in Egypt, that is to say, in the body whom he calls magicians (for it is owing to the tricks and deceits of their sophistical tricks that good dispositions and good habits are infected and corrupted), saying that he was "not an eloquent man," ¹ which is equivalent to saying that he was not formed by nature for the conjectural rhetoric of plausible and specious reasons. And immediately afterwards he confirms the assertion by adding, that he is not only not eloquent, but altogether "void of words," ² meaning this, not ^{3 4} in the sense in which we do when we call animals void of words, but speaking of himself as one who did not choose to employ words by means of his organs of speech, but who impresses and stamps the principles of true wisdom upon his mind alone, which is the most perfect opposite to false sophistry.