And the end or use of a horse or of anything would be that which could not be accomplished, or not so well accomplished, by any other thing?

I do not understand, he said.

Let me explain: Can you see, except with the eye?

Certainly not.

Or hear, except with the ear?

No.

These then may be truly said to be the ends of these organs?

They may.

But you can cut off a vine-branch with a dagger or with a chisel, and in many other ways?

Of course.

And yet not so well as with a pruning-hook made for the purpose?