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In cases where no stipulation as to the respective services is

made they who disinterestedly do the first service will not raise

the question (as we have said before), because it is the nature

of Friendship, based on mutual goodness to be reference to the

intention of the other, the intention being characteristic of the

true friend and of goodness.

And it would seem the same rule should be laid down for those who

are connected with one another as teachers and learners of

philosophy; for here the value of the commodity cannot be

measured by money, and, in fact, an exactly equivalent price

cannot be set upon it, but perhaps it is sufficient to do what

one can, as in the case of the gods or one's parents.