[157] [cap.56] And these things are not mere fabulous inventions, in which the race of poets and sophists delights, but are rather types shadowing forth some allegorical truth, according to some mystical explanation. And any one who follows a reasonable train of conjecture, will say with great propriety, that the aforesaid serpent is the symbol of pleasure, because in the first place he is destitute of feet, and crawls on his belly with his face downwards. In the second place, because he uses lumps of clay for food. Thirdly, because he bears poison in his teeth, by which it is his nature to kill those who are bitten by him.