As the horse will frequently have to gallop
						down hill and up hill and along a slope, and as he will have to leap over,
						and to leap out, and to jump down at various times, the rider must teach and
						practise both himself and his horse in all these things. For thus they will
						be able to help each other, and will be thought altogether more efficient.
					 If anyone thinks that we are repeating
						ourselves, because we are referring to matters already dealt with, this is
						not repetition. For we recommended the purchaser to try whether the horse
						could do these things at the time of buying: but now we say that a man
						should teach his own horse; and we will show how to teach him.