《Tetrabiblos》Knowledge May Be Acquired By Astronomy To A Certain ExtentClaudius Ptolemy（Ashmand 英譯 1822）
In the first place, the science demands the greatest study and a constant attention to a multitude of different points; and as all persons who are but imperfectly practised in it must necessarily commit frequent mistakes, it has been supposed that even such events as have been truly predicted have taken place by chance only, and not from any operative cause in nature.
段落 tetra-1-knowledgem-31public-domain (Ashmand 1822)
↗ 開啟公有領域原文（Wikisource）此段為公有領域典籍逐字擷取，零 AI 生成；原文亦存繁化前底本，可逐字審計。我們寧可少引、不可錯引——驗不過的引文一律捨棄。