On the Allegories of the Sacred Laws (2.88-2.92)

Nor, indeed, does the pleasure which is in the form of a serpent, abstain from attacking that most sincere lover of God, Moses, for we read as follows; If, therefore, they will not obey me, nor listen to my voice—for they will say, God has not been seen by you—what shall I say to them? And the Lord said unto Moses, What is that which is in thy hand? And he said, A rod. And God said, Cast it on the ground. And he cast it on the ground, and it became a serpent, and Moses fled from it. And the Lord said unto Moses, Stretch forth thy hand, and take hold of it by the tail. And having stretched forth his hand, he took hold of it by the tail, and it became a rod in his hand. And the Lord said unto him, That they may believe thee.[*]

How can any one believe God? If he has learnt that all other things are changed, but that he alone is unchangeable. Therefore, God asks of the wise Moses what there is in the practical life of his soul; for the hand is thesymbol of action. And

Well, therefore, does the God-loving Moses answer. For truly the actions of the virtuous man are supported by education as by a rod, tranquillizing the disturbances and agitations of the mind. This rod, when cast away, becomes a serpent. Very appropriately. For if the soul casts away instruction, it becomes fond of pleasure instead of being fond of virtue. On which account Moses fled from it, for the man who is fond of virtue does flee from passion and from pleasure.

But God did not praise his flight. For it is fitting, indeed, for your mind, before you are made perfect, to meditate flight and escape from the passions; but Moses, that perfect man, ought rather to persevere in his war against them, and to resist them, and to strive against them, otherwise they, relying on their freedom from danger and on their power, will ascend up I to the citadel of the soul, and take it by storm, and will plunder it entirely, like a tyrant.

On which account God commanded Moses to take hold of it by the tail, that is to say, let not the hostile and untameable spirit of pleasure terrify you, but with all your power take hold of it, and seize it firmly, and master it. For it will again become a rod instead of a serpent, that is to say, instead of pleasure it will become instruction in your hand;