Now the compilers of narratives say that in the island of Britain there is a cave situated under a mountain, and a chasm on its summit; and that, accordingly, when the wind falls into the cave, and rushes into the bosom of the cleft, a sound is heard like cymbals clashing musically. And often in the woods, when the leaves are moved by a sudden gust of wind, a sound is emitted like the song of birds. Those also who composed the _Persics_ relate that in the uplands, in the country of the Magi, three mountains are situated on an extended plain, and that those who travel through the locality, on coming to the first mountain, hear a confused sound as of several myriads shouting, as if in battle array; and on reaching the middle one, they hear a clamour louder and more distinct; and at the end hear people singing a pæan, as if victorious. And the cause, in my opinion, of the whole sound, is the smoothness and cavernous character of the localities; and the air, entering in, being sent back and going to the same point, sounds with considerable force. Let these things be so. But it is possible for God Almighty, even without a medium, to produce a voice and vision through the ear, showing that His greatness has a natural order beyond what is customary, in order to the conversion of the hitherto unbelieving soul, and the reception of the commandment given. But there being a cloud and a lofty mountain, how is it not possible to hear a different sound, the wind moving by the active cause? Wherefore also the prophet says, “Ye heard the voice of words, and saw no similitude.”[958] You see how the Lord’s voice, the Word, without shape, the power of the Word, the luminous word of the Lord, the truth from heaven, from above, coming to the assembly of the church, wrought by the luminous immediate ministry. CHAPTER IV. THE GREEKS DREW MANY OF THEIR PHILOSOPHICAL TENETS FROM THE EGYPTIAN AND INDIAN GYMNOSOPHISTS.