How to translate "The proper study of mankind has been said to be man"

How to translate "The proper study of mankind has been said to be man"

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送交者: hopelessless 于 2015-12-16, 02:46:53:

人都是屁此屁此，尽管性是hopeless。 (无内容) - cornbug (0 bytes) 2015-12-16, 06:36:26 (796621)
翻译需要上下文，你以前问的时候别人就说过 (无内容) - conner (0 bytes) 2015-12-16, 06:20:00 (796620)
- The whole paragraph is here...(thanks) - hopelessless (523 bytes) 2015-12-16, 15:38:10 (796717)