《Tetrabiblos》Book 1Claudius Ptolemy（Ashmand 英譯 1822）
The present work shall, however, be regulated by that due regard for truth which philosophy demands: and since the material quality of the objects acted upon renders them weak and variable, and difficult to be accurately apprehended, no positive or infallible rules (as were given in detailing the first doctrine, which is always governed by the same immutable laws) can be here set forth: while, on the other hand, a due observation of most of those general events, which evidently trace their causes to the Ambient, shall not be omitted.
段落 tetra-1-ch-3public-domain (Ashmand 1822)
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