Sextus Empiricus Pyrrhoniae Hypotyposes 2.6.48

[48] Concerning this criterion ¹ the controversy which exists amongst the Dogmatists is fierce and, one may say, unending. We, however,—with a view here also to a systematic treatment,—maintain that inasmuch as Man is, according to them, the criterion ‟By whom” matters are judged, and Man (as they also themselves agree) can have no other instrument by means of which he will be able to judge except sense and intellect, then if we shall show that he is unable to judge by means of either sense alone or intellect alone or both conjoined, we shall have given a concise answer to all the individual opinions; for they can all, as it seems, be referred to these three rival theories.

Let us begin with the senses.