What's the meaning of this sentence ? (I'm confused by the sentence after the comma)
To conquer fear is the beginning of wisdom, in the pursuit of truth as in the endeavor after a worthy manner of life.
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The author is saying that:
"To conquer fear is the beginning of wisdom" is true, both when trying to find truth in general, and when trying to live life in a good way. That is, it says that this rule applies both to "the pursuit of truth" and to "the endeavor after a worthy manner of life."
The use of "the endeavor after" seems a bit awkward to me, although grammatically perfectly correct. It means "the attempt to achieve" or perhaps "striving to achieve" expresses it a bit better, as "endeavor" implies continued effort.