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But the rational and the irrational appear such in a different way to different persons, just as the good and the bad, the profitable and the unprofitable. For this reason, particularly, we need discipline, in order to learn how to adapt the preconceptionThe preconception πρόληψις is thus defined by the Stoics: ἐστι δὴ ἡ πρόληψις ἔννοια φυσικὴ τῶν καθʼ ὅλου (Diogenes Laert. vii.). We name Anticipation all knowledge, by which I can à priori know and determine that which belongs to empirical knowledge, and without doubt this is the sense in which Epicurus used his expression πρόληψις (Kant, Kritik der reinen Vernunft, p. 152, 7th ed.). He adds: But since there is something in appearances which never can be known à priori, and which consequently constitutes the difference between empirical knowledge and knowledge à priori, that is, sensation (as the material of observation), it follows that this sensation is specially that which cannot be anticipated (it cannot be a πρόληψις). On the other hand, we could name the pure determinations in space and time, both in respect to form and magnitude, anticipations of the appearances, because these determinations represent à priori whatever may be presented to us à posteriori in experience. see also p. 8, etc. of the rational and the irrational to the several things conformably to nature. But in order to determine the rational and the irrational, we use not only the estimates of external things, but we consider also what is appropriate to each person. For to one man it is consistent with reason to hold a chamber pot for another, and to look to this only, that if he does not hold it, he will receive stripes, and he will not receive his food: but if he shall hold the pot, he will not suffer anything hard or disagreeable. But to another man not only does the holding of a chamber pot appear intolerable for himself, but intolerable also for him to allow another to do this office for him. If then you ask me whether you should hold the chamber pot or not, I shall say to you that the receiving of food is worth more than the not receiving of it, and the being scourged is a greater indignity than not being scourged; so that if you measure your interests by these things, go and hold the chamber pot. But this, you say, would not be worthy of me. Well then, it is you who must introduce this consideration into the inquiry, not I; for it is you who know yourself, how much you are worth to yourself, and at what price you sell yourself; for men sell themselves at various prices.
