Sextus Empiricus Pyrrhoniae Hypotyposes 3.23.182

[182] If, then, things which move by nature move all men alike, while we are not all moved alike by the so-called goods, there is nothing good by nature. In fact it is impossible to believe either all the views now set forth, because of their conflicting character, or any one of them. For he who asserts that one must believe this view, but not that, becomes a party to the controversy, since he has opposed to him the arguments of those who take the rival view, and therefore he himself, along with the rest, will need an adjudicator instead of pronouncing judgement on others. And as there does not exist any agreed criterion or proof ¹ owing to the unsettled controversy about these matters, he will be reduced to suspending judgement, and consequently he will be unable to affirm positively what the good by nature is.