a non posse ad non esse sequitur argumentum necessarie negative, licet non affirmative

/ey non posiy aed non esiy sekwatar argyamentam nesaseriyiy negatayviy, laysat non afarmatayviy/

A literal translation: From impossibility to non-existence the inference follows necessarily in the negative, though not in the affirmative-is as ambiguous as the original.

It could be translated thus:

The negative inference of non-existence necessarily follows from impossibility of existence, but the affirmative inference of existence cannot be drawn from mere possibility