SOCRATES: I wonder whether you would agree with me about the origin of pleasure and pain.
PROTARCHUS: What do you mean?
SOCRATES: I mean to say that their natural seat is in the mixed class.
PROTARCHUS: And would you tell me again, sweet Socrates, which of the aforesaid classes is the mixed one?
SOCRATES: I will, my fine fellow, to the best of my ability.
PROTARCHUS: Very good.
SOCRATES: Let us then understand the mixed class to be that which we placed third in the list of four.
PROTARCHUS: That which followed the infinite and the finite; and in which you ranked health, and, if I am not mistaken, harmony.
SOCRATES: Capital; and now will you please to give me your best attention?
PROTARCHUS: Proceed; I am attending.