To be absolutely certain about something, one must know everything or nothing about it.

Summary

This quote suggests that true certainty can only be achieved when one possesses either complete knowledge or no knowledge at all about a particular subject. If one lacks any information about a topic, their ignorance allows them to be confident and certain in their lack of understanding. On the other hand, if someone possesses all-encompassing knowledge, their comprehensive understanding gives them the ability to be certain about something. The quote highlights that certainty requires extreme ends of knowledge or ignorance, implying that partial knowledge often leads to doubt or uncertainty.

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