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Quarrels arise also when the parties realise different results

and not those which they desire; for the not attaining one's

special object is all one, in this case, with getting nothing at

all: as in the well-known case where a man made promises to a

musician, rising in proportion to the excellence of his music;

but when, the next morning, the musician claimed the performance

of his promises, he said that he had given him pleasure for

pleasure: of course, if each party had intended this, it would

have been all right: but if the one desires amusement and the

other gain, and the one gets his object but the other not, the

dealing cannot be fair: because a man fixes his mind upon what he

happens to want, and will give so and so for that specific thing.