In what does Scepticism differ from the Cyrenaic Philosophy?
Some say that the Cyrenaic School is the same as the Sceptical, because that school also claims to comprehend only conditions of mind. It differs, however, from it, because, while the former makes pleasure and the gentle motion of the flesh its aim, we make ἀταραξία ours, and this is opposed to the aim of their school. For whether pleasure is present or not, confusion awaits him who maintains that pleasure is an aim, as I have shown in what I said about the aim. And then, in addition, we suspend our judgment as far as the reasoning with regard to external objects is concerned, but the Cyrenaics pronounce the nature of these inscrutable.
CHAPTER XXXII.
In what does Scepticism differ from the Philosophy of Protagoras?
Protagoras makes man the measure of all things, of things that are that they are, and things that are not that they are not, meaning by measure, criterion, and by things, events, that is to say really, man is the criterion for all events, of things that are that they are, and of things that are not that they are not. And for that reason he accepts only the phenomena that appear to each man, and thus he introduces relation. Therefore he seems to have community with the Pyrrhoneans. He differs, however, from them, and we shall see the difference after we have somewhat explained how things seemed to Protagoras. He says, for example, that matter is fluid, and as it flows, additions are constantly made in the place of that which is carried away; the perceptions also are arranged anew and changed, according to the age and according to other conditions of the body. He says also, that the reasons of all phenomena are present in matter, so that matter can be all that it appears to be to all men as far as its power is concerned. Men, however, apprehend differently at different times, according to the different conditions that they are in; for he that is in a natural condition will apprehend those qualities in matter that can appear to those who are in a natural condition, while on the contrary, those who are in an unnatural condition will apprehend those qualities that can appear to the abnormal. Furthermore, the same reasoning would hold true in regard to differences in age, to sleeping and waking, and each of the other different conditions. Therefore man becomes the criterion of things that are, for all things that appear to men exist for men, and those things that do not appear to any one among men do not exist. We see that he dogmatises in saying that matter is fluid, and also in saying that the reasons for all phenomena have their foundation in matter, while these things are unknown, and to us are things regarding which we suspend our judgment.
CHAPTER XXXIII.
In what does Scepticism differ from the Academic Philosophy?
Some say further that the Academic philosophy is the same as Scepticism, therefore it seems appropriate to me to treat of that also. There have been, as the most say, three Academies—the most ancient one, that of Plato and his followers; the second and middle one, that of Arcesilaus and his followers, Arcesilaus being the pupil of Polemo; the third and new Academy, that of Carneades and Clitomachus and their followers; some add also a fourth, that of Philo and Charmides, and their followers; and some count even a fifth, that of Antiochus and his followers. Beginning then from the old Academy, let us consider the difference between the schools of philosophy mentioned. Now some have said that Plato was a Dogmatic, others that he was a Sceptic, and others that he was in some things a Sceptic and in some things a Dogmatic. For in the fencing dialogues, where Socrates is introduced as either making sport of someone or contending against the Sophists, Plato has, they say, a fencing and sceptical character, but he is dogmatic when he expresses himself seriously, either through Socrates or Timaeus or any such person. In regard to those who say that he is a Dogmatic, or a Dogmatic in some things and a Sceptic in others, it would be superfluous, it seems to me, to speak now, for they themselves grant that he is different from us. The question as to whether he was really a Sceptic or not we treat more fully in the Memoranda, but here we state briefly that according to Menodotus and Aenesidemus (for these especially defended this position) Plato dogmatises when he expresses himself regarding ideas, and regarding the existence of Providence, and when he states that the virtuous life is more to be chosen than the one of vice. If he assents to these things as true, he dogmatises; or even if he accepts them as more probable than otherwise he departs from the sceptical character, since he gives a preference to one thing above another in trustworthiness or untrustworthiness; for how foreign this is to us is evident from what we have said before. Even if when he performs mental gymnastics, as they say, he expresses some things sceptically, he is not because of this a Sceptic. For he who dogmatises about one thing, or, in short, gives preference to one mental image over another in trustworthiness or untrustworthiness in respect to anything that is unknown, is a Dogmatic in character, as Timon shows by what he said of Xenophanes. For after having praised Xenophanes in many things, and even after having dedicated his Satires to him, he made him mourn and say—