they are reliefs of pain.

That is true.

And the anticipations of future pleasures and pains are of a like nature?

Yes.

Shall I give you an illustration of them?

Let me hear.

You would allow, I said, that there is in nature an upper and lower and middle region?

I should.

And if a person were to go from the lower to the middle region, would he not imagine that he is going up; and he who is standing in the middle and sees whence he has come, would imagine that he is already in the upper region, if he has never seen the true upper world?

To be sure, he said; how can he think otherwise?