1. Plato, Theaetetus, 183a (5th cent. BCE - 4th cent. BCE)
| 183a. THEO. So it seems. SOC. This would be a fine result of the correction of our answer, when we were so eager to show that all things are in motion, just for the purpose of making that answer prove to be correct. But this, I think, did prove to be true, that if all things are in motion, every answer to any question whatsoever is equally correct, and we may say it is thus or not thus—or, if you prefer, becomes thus, to avoid giving them fixity by using the word is. THEO. You are right. SOC. Except, Theodorus, that I said thus, and not thus ; but we ought not even to say thus ; |
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2. Cicero, On The Ends of Good And Evil, 1.63 (2nd cent. BCE - 1st cent. BCE)
| 1.63. optime vero Epicurus, quod exiguam dixit fortunam intervenire sapienti maximasque ab eo et ab eo et om. R et ( ante gravissimas) om. V gravissimas res consilio ipsius et ratione administrari neque maiorem voluptatem ex infinito tempore aetatis percipi posse, quam ex hoc percipiatur, quod videamus esse finitum. In dialectica autem vestra nullam existimavit esse nec ad melius vivendum nec ad commodius disserendum viam. viam om. R In physicis plurimum posuit. ea scientia et verborum vis et natura orationis et consequentium repugtiumve ratio potest perspici. percipi R omnium autem rerum natura cognita levamur superstitione, liberamur mortis metu, non conturbamur ignoratione rerum, e qua ipsa horribiles existunt saepe formidines. denique etiam morati melius erimus, cum didicerimus quid natura desideret. tum vero, si stabilem scientiam rerum tenebimus, servata illa, quae quasi delapsa de caelo est ad cognitionem omnium, regula, ad quam omnia iudicia rerum omnium rerum regula R 1 dirigentur, numquam ullius oratione victi sententia desistemus. | |
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3. Cicero, On The Nature of The Gods, 1.10 (2nd cent. BCE - 1st cent. BCE)
| 1.10. Those however who seek to learn my personal opinion on the various questions show an unreasonable degree of curiosity. In discussion it is not so much weight of authority as force of argument that should be demanded. Indeed the authority of those who profess to teach is often a positive hindrance to those who desire to learn; they cease to employ their own judgement, and take what they perceive to be the verdict of their chosen master as settling the question. In fact I am not disposed to approve the practice traditionally ascribed to the Pythagoreans, who, when questioned as to the grounds of any assertion that they advanced in debate, are said to have been accustomed to reply 'He himself said so,' 'he himself' being Pythagoras. So potent was an opinion already decided, making authority prevail unsupported by reason. |
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4. Cicero, Lucullus, 18, 77, 104 (2nd cent. BCE - 1st cent. BCE)
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5. Lucretius Carus, On The Nature of Things, 4.513-4.521 (1st cent. BCE - 1st cent. BCE)
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6. Epictetus, Discourses, 1.28.28-1.28.30, 2.11.20, 2.11.22-2.11.25, 3.3.14-3.3.15, 4.12.12 (1st cent. CE - 2nd cent. CE)
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7. Epictetus, Enchiridion, 1.5 (1st cent. CE - 2nd cent. CE)
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8. Seneca The Younger, Letters, 89.11 (1st cent. CE - 1st cent. CE)
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9. Sextus, Against The Mathematicians, 7.30, 7.34-7.38, 7.46-7.425, 7.427-7.442 (2nd cent. CE - 3rd cent. CE)
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10. Sextus, Outlines of Pyrrhonism, 1.170-1.172, 2.22, 2.26, 2.31, 2.38-2.42, 2.70 (2nd cent. CE - 3rd cent. CE)
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11. Diogenes Laertius, Lives of The Philosophers, 7.46, 7.50, 9.94, 10.27, 10.32 (3rd cent. CE - 3rd cent. CE)
| 7.46. There are two species of presentation, the one apprehending a real object, the other not. The former, which they take to be the test of reality, is defined as that which proceeds from a real object, agrees with that object itself, and has been imprinted seal-fashion and stamped upon the mind: the latter, or non-apprehending, that which does not proceed from any real object, or, if it does, fails to agree with the reality itself, not being clear or distinct.Dialectic, they said, is indispensable and is itself a virtue, embracing other particular virtues under it. Freedom from precipitancy is a knowledge when to give or withhold the mind's assent to impressions. 7.50. There is a difference between the process and the outcome of presentation. The latter is a semblance in the mind such as may occur in sleep, while the former is the act of imprinting something on the soul, that is a process of change, as is set forth by Chrysippus in the second book of his treatise of the Soul (De anima). For, says he, we must not take impression in the literal sense of the stamp of a seal, because it is impossible to suppose that a number of such impressions should be in one and the same spot at one and the same time. The presentation meant is that which comes from a real object, agrees with that object, and has been stamped, imprinted and pressed seal-fashion on the soul, as would not be the case if it came from an unreal object. 9.94. We must not assume that what convinces us is actually true. For the same thing does not convince every one, nor even the same people always. Persuasiveness sometimes depends on external circumstances, on the reputation of the speaker, on his ability as a thinker or his artfulness, on the familiarity or the pleasantness of the topic.Again, they would destroy the criterion by reasoning of this kind. Even the criterion has either been critically determined or not. If it has not, it is definitely untrustworthy, and in its purpose of distinguishing is no more true than false. If it has, it will belong to the class of particular judgements, so that one and the same thing determines and is determined, and the criterion which has determined will have to be determined by another, that other by another, and so on ad infinitum. 10.27. hence he has frequently repeated himself and set down the first thought that occurred to him, and in his haste has left things unrevised, and he has so many citations that they alone fill his books: nor is this unexampled in Zeno and Aristotle. Such, then, in number and character are the writings of Epicurus, the best of which are the following:of Nature, thirty-seven books.of Atoms and Void.of Love.Epitome of Objections to the Physicists.Against the Megarians.Problems.Sovran Maxims.of Choice and Avoidance.of the End.of the Standard, a work entitled Canon.Chaeredemus.of the Gods.of Piety. 10.32. Nor is there anything which can refute sensations or convict them of error: one sensation cannot convict another and kindred sensation, for they are equally valid; nor can one sensation refute another which is not kindred but heterogeneous, for the objects which the two senses judge are not the same; nor again can reason refute them, for reason is wholly dependent on sensation; nor can one sense refute another, since we pay equal heed to all. And the reality of separate perceptions guarantees the truth of our senses. But seeing and hearing are just as real as feeling pain. Hence it is from plain facts that we must start when we draw inferences about the unknown. For all our notions are derived from perceptions, either by actual contact or by analogy, or resemblance, or composition, with some slight aid from reasoning. And the objects presented to mad-men and to people in dreams are true, for they produce effects – i.e. movements in the mind – which that which is unreal never does. |
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12. Stoic School, Stoicor. Veter. Fragm., 1.60, 2.53
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