An ass and a mule went laden over a brook, the one with salt, the other with wool; the mule’s pack was wetted by chance, the salt melted, his burden the lighter, and he thereby much eased; he told the ass, who, thinking to speed as well, wet his pack likewise at the next water, but it was much the heavier, and consequently he quite tired. So one thing may be good and bad to several parties, upon diverse occasions (Prudenti diffidentia / Nil est melius, nil utilius mortalibus).