Concerning the Ten Commandments, which are the Heads of the Law (32-34)

This, then, may be enough to say on these subjects; but it is necessary now to connect with these things what I am about to say, namely, that it was the Father of the universe who delivered these ten maxims, or oracles, or laws and enactments, as they truly are, to the whole assembled nation of men and women altogether. Did he then do so, uttering himself some kind of voice? Away! let not such an idea ever enter your mind; for God is not like a man, in need of a mouth, and of a tongue, and of a windpipe,

but as it seems to me, he at that time wrought a most conspicuous and evidently holy miracle, commanding an invisible sound to be created in the air, more marvellous than all the instruments that ever existed, attuned to perfect harmonies; and that not an inanimate one, nor yet, on the other hand, one that at all resembled any nature composed of soul and body; but rather it was a rational soul filled with clearness and distinctness, which fashioned the air and stretched it out and changed it into a kind of flaming fire, and so sounded forth so loud and articulate a voice like a breath passing through a trumpet, so that those who were at a great distance appeared to hear equally with those who were nearest to it.

For the voices of men, when they are spread over a very long distance, do naturally become weaker and weaker, so that those who are at a distance from them cannot arrive at a clear comprehension of them, but their understanding is gradually dimmed by the extension of the sound over a larger space, since the organs also by which it is extended are perishable.