The Nicomachean ethics of Aristotle · Aristotle
Chapter I.
Well, in all the Friendships the parties to which are dissimilar it is the proportionate which equalises and preserves the Friendship, as has been already stated: I mean, in the Social Friendship the cobbler, for instance, gets an equivalent for his shoes after a certain rate; and the weaver, and all others in like manner. Now in this case a common measure has been provided in money, and to this accordingly all things are referred and by this are measured: but in the Friendship of Love the complaint is sometimes from the lover that, though he loves exceedingly, his love is not requited; he having perhaps all the time nothing that can be the object of Friendship: again, oftentimes from the object of love that he who as a suitor promised any and every thing now performs nothing. These cases occur because the Friendship of the lover for the beloved object is based upon pleasure, that of the other for him upon utility, and in one of the parties the requisite quality is not found: for, as these are respectively the grounds of the Friendship, the Friendship comes to be broken up because the motives to it cease to exist: the parties loved not one another but qualities in one another which are not permanent, and so neither are the Friendships: whereas the Friendship based upon the moral character of the parties, being independent and disinterested, is permanent, as we have already stated.
“With specified reward a friend should be content.” They are certainly fairly found fault with who take the money in advance and then do nothing of what they said they would do, their promises having been so far beyond their ability; for such men do not perform what they agreed, The Sophists, however, are perhaps obliged to take this course, because no one would give a sixpence for their knowledge. These then, I say, are fairly found fault with, because they do not what they have already taken money for doing. 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.
But where the original giving is not upon these terms but avowedly for some return, the most proper course is perhaps for the requital to be such as _both_ shall allow to be proportionate, and, where this cannot be, then for the receiver to fix the value would seem to be not only necessary but also fair: because when the first giver gets that which is equivalent to the advantage received by the other, or to what he would have given to secure the pleasure he has had, then he has the value from him: for not only is this seen to be the course adopted in matters of buying and selling but also in some places the law does not allow of actions upon voluntary dealings; on the principle that when one man has trusted another he must be content to have the obligation discharged in the same spirit as he originally contracted it: that is to say, it is thought fairer for the trusted, than for the trusting, party, to fix the value. For, in general, those who have and those who wish to get things do not set the same value on them: what is their own, and what they give in each case, appears to them worth a great deal: but yet the return is made according to the estimate of those who have received first, it should perhaps be added that the receiver should estimate what he has received, not by the value he sets upon it now that he has it, but by that which he set upon it before he obtained it.
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