How to know, oh how to know! ...

How to know, oh how to know! All is relative ease and facility in orthodoxy, yet how can it be denied that good is in itself undeniable? Absolutes are the most uncertain of all formulations, while the uncertainties are the most real.
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 Jack Vance

Quotes from the same author

Freedom, privileges, options, must constantly be exercised, even at the risk of inconvenience.
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 Jack Vance
There are no absolute certainties in this universe. A man must try to whip order into a yelping pack of probabilities, and uniform success is impossible.
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 Jack Vance
The universe is eight billion years old, the last two billion of which have produced intelligent life. During this time not one hour of absolute equity has prevailed.
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 Jack Vance
I categorically declare first my absolute innocence, second my lack of criminal intent, and third my effusive apologies.
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 Jack Vance
You used the word "civilization", which means a set of abstractions, symbols, conventions. Experience tends to be vicarious; emotions are predigested and electrical; ideas become more real than things.
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 Jack Vance