添加了五章的题记

Preface/pre1.txt

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+心智的活动，除了尽力产生各种简单的认识之外，主要表现在如下三个方面：1）将若干简单认识组合为一个复合认识，由此产生出各种复杂的认识。2）将两个认识放在一起对照，不管它们如何简单或者复杂，在这样做时并不将它们合而为一。由此得到有关它们的相互关系的认识。3）将有关认识与那些在实际中和它们同在的所有其他认识隔离开，这就是抽象，所有具有普遍性的认识都是这样得到的。
+John Locke, An Essay Concerning Human Understanding
+（有关人类理解的随笔，1690）
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+The acts of the mind, wherein it exerts its power over simple ideas, are chiefly these three: 1. Combining several simple ideas into one compound one, and thus all complex ideas are made. 2. The second is bringing two ideas, whether simple or complex, together, and setting them by one another so as to take a view of them at once, without uniting them into one, by which it gets all its ideas of relations. 3. The third is separating them from all other ideas that accompany them in their real existence: this is called abstraction, and thus all its general ideas are made.
+John Locke, An Essay Concerning Human Understanding
+(1690)

Preface/pre2.txt

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+现在到了数学抽象中最关键的一步：让我们忘记这些符号所表示的对象。……（数学家）不应在这里停步，有许多操作可以应用与这些符号，而根本不必考虑它们到底代表着什么东西。
+Hermann Weyl, The Mathematical Way of Thinking
+(思维的数学方式)
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+We now come to the decisive step of mathematical abstraction: we forget about what the symbols stand for. ...[The mathematician] need not be idle; there are many operations which he may carry out with these symbols, without ever having to look at the things they stand for.
+Hermann Weyl, The Mathematical Way of Thinking

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+即使在变化中，它也丝毫未变。
+——赫拉克立特（Heraclitus）
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+变得越多，它就越是原来的样子。
+——阿尔芬斯·卡尔（Alphonse Karr）
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+(Even while it changes, it stands still.)
+Heraclitus
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+Plus ça change, plus c'est la même chose.
+Alphonse Karr

Preface/pre4.txt

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+用普通的话来说，这个咒语就是——阿巴拉卡达巴拉，芝麻开门，而且还有另外的东西——在一个故事里的咒语在另一故事里就不灵了。真正的魔力在于知道哪个咒语有用，在什么时候，用于做什么，其诀窍就在于学会有关的诀窍。
+而这些咒语也是用我们的字母表里的字母拼出来的，这个字母表中不过是几十个可以用笔画出来的弯弯曲线。这就是最关键的！而那些珍宝也是如此，如果我们能将它们拿到手中的话！这就像是说，就像通向珍宝的钥匙就是珍宝！
+——John Barth, Chimera（奇想）
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+... It's in words that the magic is -- Abracadabra, Open Sesame, and the rest -- but the magic words in one story aren't magical in the next. The real magic is to understand which words work, and when, and for what; the trick is to learn the trick.
+... And those words are made from the letters of our alphabet: a couple-dozen squiggles we can draw with the pen. This is the key! And the treasure, too, if we can only get our hands on it! It's as if -- as if the key to the treasure is the treasure!
+John Barth, Chimera

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+我的目的是想说明，这一天空机器并不是一种天赐造物或者生命体，它只不过是钟表一类的机械装置（而那些相信钟表有灵魂的人却将这一工作说成是其创造者的荣耀），在很大程度上，这里多种多样的运动都是由最简单的物质力量产生的，就像钟表里所有活动都是由一个发条产生的一样。
+——约翰尼斯·开普勒（给Herwart von Hohenburg的信，1605）
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+My aim is to show that the heavenly machine is not a kind of divine, live being, but a kind of clockwork (and he who believes that a clock has soul attributes the maker's glory to the work), insofar as nearly all the manifold motions are caused by a most simple and material force, just as all motions of the clock are caused by a single weight.
+Johannes Kepler (letter to Herwart von Hohenburg, 1605)