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Book VII Chapter 15
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Since substance is of two kinds, the concrete thing and the formula (I mean that one kind of substance is the formula taken with the matter, while another kind is the formula in its generality), substances in the former sense are capable of destruction (for they are capable also of generation), but there is no destruction of the formula in the sense that it is ever in course of being destroyed (for there is no generation of it either; the being of house is not generated, but only the being of this house), but without generation and destruction formulae are and are not; for it has been shown that no one begets1 nor makes these. For this reason, also, there is neither definition of nor demonstration2 about sensible individual substances, because they have matter whose nature is such that they are capable both of being and of not being; for which reason all the individual instances of them are destructible. If then demonstration is of necessary truths and definition is a scientific process, and if, just as knowledge cannot be sometimes knowledge and sometimes ignorance, but the state which varies thus is opinion, so too demonstration and definition cannot vary thus, but it is opinion that deals with that which can be otherwise than as it is, clearly there can neither be definition of nor demonstration about sensible individuals. For perishing things are obscure to those who have the relevant knowledge, when they have passed from our perception; and though the formulae remain in the soul unchanged, there will no longer be either definition or demonstration. And so when one of the definition-mongers defines any individual, he must recognize that his definition may always be overthrown3; for it is not possible to define such things.

Nor is it possible to define any Idea. For the Idea is, as its supporters say, an individual, and can exist apart; and the formula must consist of words; and he who defines must not invent a word (for it would be unknown), but the established words are common to all the members of a class; these then must apply to something besides the thing defined; e.g. if one were defining you, he would say ‘an animal which is lean’ or ‘pale’, or something else which will apply also to some one other than you. If any one were to say that perhaps all the attributes taken apart may belong to many subjects, but together they belong only to this one, we must reply first that they belong also to both the elements; e.g. ‘two-footed animal’ belongs to animal and to the two-footed. (And in the case of eternal entities4 this is even necessary, since the elements are prior to and parts of the compound; nay5 more, they can also exist apart, if ‘man’ can exist apart. For either neither or both can. If, then, neither can, the genus will not exist apart from the various species; but if it does, the differentia will also.) Secondly6, we must reply that ‘animal’ and ‘two-footed’ are prior in being to ‘two-footed animal’; and things which are prior to others are not destroyed when the others are.

Again, if the Ideas consist of Ideas (as they must, since elements are simpler than the compound), it will be further necessary that the elements also of which the Idea consists, e.g. ‘animal’ and ‘two-footed’, should be predicated of many subjects. If not, how will they come to be known? For there will then be an Idea which cannot be predicated of more subjects than one. But this is not thought possible-every Idea is thought to be capable of being shared.

As has been said, then, the impossibility of defining individuals escapes notice in the case of eternal things, especially those which are unique, like the sun or the moon. For people err7 not only by adding attributes whose removal the sun would survive, e.g. ‘going round the earth’ or ‘night-hidden’ (for from their view it follows that if it stands still or is visible, it will no longer be the sun; but it is strange if this is so; for ‘the sun’ means a certain substance); but also by the mention of attributes which can belong to another subject; e.g. if another thing with the stated attributes comes into existence, clearly it will be a sun; the formula therefore is general. But the sun was supposed to be an individual, like Cleon or Socrates. After all, why does not one of the supporters of the Ideas produce a definition of an Idea? It would become clear, if they tried, that what has now been said is true.

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1 begets 900bbe1fb1fde33a940fa4c636f3859f     
v.为…之生父( beget的第三人称单数 );产生,引起
参考例句:
  • It begets at least seven standard type offspring from such matings. 这类交配中生下至少七个标准型后代。 来自辞典例句
  • Violence begets violence until the innocent perish with the guilty. 暴力招致暴力直到这因罪行而无缘无故的毁灭。 来自电影对白
2 demonstration 9waxo     
n.表明,示范,论证,示威
参考例句:
  • His new book is a demonstration of his patriotism.他写的新书是他的爱国精神的证明。
  • He gave a demonstration of the new technique then and there.他当场表演了这种新的操作方法。
3 overthrown 1e19c245f384e53a42f4faa000742c18     
adj. 打翻的,推倒的,倾覆的 动词overthrow的过去分词
参考例句:
  • The president was overthrown in a military coup. 总统在军事政变中被赶下台。
  • He has overthrown the basic standards of morality. 他已摒弃了基本的道德标准。
4 entities 07214c6750d983a32e0a33da225c4efd     
实体对像; 实体,独立存在体,实际存在物( entity的名词复数 )
参考例句:
  • Our newspaper and our printing business form separate corporate entities. 我们的报纸和印刷业形成相对独立的企业实体。
  • The North American continent is made up of three great structural entities. 北美大陆是由三个构造单元组成的。
5 nay unjzAQ     
adv.不;n.反对票,投反对票者
参考例句:
  • He was grateful for and proud of his son's remarkable,nay,unique performance.他为儿子出色的,不,应该是独一无二的表演心怀感激和骄傲。
  • Long essays,nay,whole books have been written on this.许多长篇大论的文章,不,应该说是整部整部的书都是关于这件事的。
6 secondly cjazXx     
adv.第二,其次
参考例句:
  • Secondly,use your own head and present your point of view.第二,动脑筋提出自己的见解。
  • Secondly it is necessary to define the applied load.其次,需要确定所作用的载荷。
7 err 2izzk     
vi.犯错误,出差错
参考例句:
  • He did not err by a hair's breadth in his calculation.他的计算结果一丝不差。
  • The arrows err not from their aim.箭无虚发。


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