Sextus Empiricus Pyrrhoniae Hypotyposes 1.15.173

[173] If, however, our disputant, by way of escape from this conclusion, should claim to assume as granted and without demonstration some postulate for the demonstration of the next steps of his argument, then the Mode of hypothesis will be brought in, which allows no escape. ¹ For if the author of the hypothesis is worthy of credence, we shall be no less worthy of credence every time that we make the opposite hypothesis. Moreover, if the author of the hypothesis assumes what is true he causes it to be suspected by assuming it by hypothesis rather than after proof; while if it is false, the foundation of his argument will be rotten.