Sextus Empiricus Pyrrhoniae Hypotyposes 1.14.78

[78] I have drawn this comparison (as I previously indicated) by way of super-addition, having already sufficiently proved, as I think, that we cannot prefer our own sense-impressions to those of the irrational animals. If, however, the irrational animals are not less worthy of credence than we in regard to the value of sense-impressions, and their impressions vary according to the variety of animal,—then, although I shall be able to say what the nature of each of the underlying objects appears to me to be, I shall be compelled, for the reasons stated above, to suspend judgement as to its real nature.