弗雷格的《概念文字：一种模仿算术语言构造的纯思维的形式语言》可谓现代逻辑的开山之作。
G. Frege's Begriffsschrift, a Formalized Language of Pure Thought Modelled upon the Language of Arithmetic is well-known as a foundation stone in modern logic.
这就是哲学的真正起点，因为哲学是思维着的认识活动，而这里第一次抓住了纯思维，并以纯思维本身作为认识的对象。
Such was the true starting point of philosophy, which is always knowledge by thought: and here for the first time we find pure thought seized and made an object to itself.
思维是纯能量。
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