From Plato, Protagoras 333e-334c : What is good in one case can be bad in another case.
"I know a number of things that are unprofitable to men, namely, foods, drinks, drugs, and countless others, and some that are profitable; some that are neither one nor the other to men, but are one or the other to horses; and some that are profitable only to cattle, or again to dogs; some also that are not profitable to any of those, but are to trees; and some that are good for the roots of a tree, but bad for its shoots--such as dung, [334b] which is a good thing when applied to the roots of all plants, whereas if you chose to cast it on the young twigs and branches, it will ruin all. And oil too is utterly bad for all plants, and most deadly for the hair of all animals save that of man, while to the hair of man it is helpful, as also to the rest of his body. The good is such an elusive and diverse thing that in this instance it is good for the outward parts of man's body, [334c] but at the same time as bad as can be for the inward; and for this reason all doctors forbid the sick to take oil, except the smallest possible quantity, in what one is going to eat--just enough to quench the loathing that arises in the sensations of one's nostrils from food and its dressings." (From Perseus)