On the Tilling of the Earth by Noah (71-75)

And for all his restiveness and his continued disregard of the rein, there are whips and spurs prepared, and all other instruments of punishment which have been invented by horse-breakers. And it is not wonderful: for when the horseman mounts, the art of horsemanship mounts too; so that there then being two parties borne by the horse, and skilful in horsemanship, they will very naturally get the better of one animal who is subjected to them, and who is incapable of acquiring skill.

Therefore now, leaving the consideration of these neighing animals, and of the parties carried by them, investigate, if you will, the condition of your own soul. For in its several parts you will find both horses and a rider in the fashion of a charioteer, just as you do in external things.

Now, the horses are appetite and passion, the one being male and the other female. On this account, the one giving itself airs, wishes to be unrestrained and free, and holds its head erect, as a male animal naturally does; and the other, not being free, but of a slavish disposition, and rejoicing in all kinds of crafty wickedness, devours the house, and destroys the house, for she is female. And the rider and charioteer is one, namely the mind. When, indeed, he mounts with prudence, he is a charioteer; but when he does so with folly, then he is but a rider.

For a fool, through ignorance, is unable to keep hold of the reins; but they, falling from his hands, drop on the ground. And the animals, immediately that they have got the better of the reins, run on in an ill-regulated and unrestrained course.

But the man who has mounted behind them, not being able to take hold of anything by which he may steady himself, falls, and lacerating his knees and his hands and his face, like a miserable man as he is, he bitterly weeps over his disaster; and after hanging by his feet to the chariot after he has been overturned, he is suspended, with his face upwards, lying on his back; and as the chariot proceeds, he is dragged along, and injured in his head, and neck, and both his shoulders; and then, being hurried on in this direction and in that, and being dashed against everything which lies in the way, he endures a most pitiable death.