Sextus Empiricus Pyrrhoniae Hypotyposes 3.5.29

[29] From all this we conclude finally that—if the arguments by which it was shown ¹ that we ought to affirm the existence of Cause are plausible, and if the arguments which go to prove that it is improper to declare that any Cause exists are likewise plausible, and if it is inadmissible to prefer any of these arguments to the others, since, as we have shown above, ² we confessedly possess neither sign nor criterion nor proof,—we are compelled to suspend judgement concerning the real existence of Cause, declaring that a Cause is ‟no more” existent than non-existent, if we are to judge by the statements made by the Dogmatists.