Sextus Empiricus Pyrrhoniae Hypotyposes 2.12.140

[140] Of true arguments, again, some are ‟probative,” some ‟non-probative;” and the probative are those which deduce something non-evident by means of pre-evident premisses, the non-probative those not of this sort. ¹ For example, an argument such as this— ‟If it is day it is light; but in fact it is day; therefore it is light” is not probative; for its conclusion, that ‟it is light,” is pre-evident. But an argument like this—‟If sweat pours through the surface, there are insensible pores; ² but in fact sweat does pour through the surface; therefore there are insensible pores”—is a probative one, as its conclusion (‟there are therefore insensible pores”) is non-evident.