Exactly so, he said.

There is no difficulty in understanding this.

None whatever.

But the question is not quite so easy when we proceed to ask whether these principles are three or one; whether, that is to say, we learn with one part of our nature, are angry with another, and with a third part desire the satisfaction of our natural appetites; or whether the whole soul comes into play in each sort of action — to determine that is the difficulty.

Yes, he said; there lies the difficulty.

Then let us now try and determine whether they are the same or different.

How can we? he asked.

I replied as follows: The same