On the Cavalry Commander (9.1-9.2)

So far we have described how to avoid being cheated in buying a colt or a horse, how to avoid spoiling him in usage and how to impart to a horse all the qualities required by a cavalryman for war. It is time perhaps to give directions, in case one has to deal with a horse that is too spirited or too sluggish, for the correct way of managing either.

First, then, it must be realised that spirit in a horse is precisely what anger is in a man. Therefore, just as you are least likely to make a man angry if you neither say nor do anything disagreable to him, so he who abstains from annoying a spirited horse is least likely to rouse his anger.