When one has once accepted ...

When one has once accepted and absorbed Evil, it no longer demands the unfitness of the means. The ulterior motives with which youabsorb and assimilate Evil are not your own but those of Evil.... Evil is whatever distracts. Evil knows of the Good, but Good does not know of Evil. Knowledge of oneself is something only Evil has. One means that Evil has is the dialogue.... One cannot pay Evil in installments--and one always keeps on trying to.
When one has once accepted and absorbed Evil, it no longer demands the unfitness of the means. The ulterior motives with which youabsorb and assimilate Evil are not your own but those of Evil.... Evil is whatever distracts. Evil knows of the Good, but Good does not know of Evil. Knowledge of oneself is something only Evil has. One means that Evil has is the dialogue.... One cannot pay Evil in installments--and one always keeps on trying to.
 Franz Kafka

Quotes from the same author

Start with what is right rather than what is acceptable.
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 Franz Kafka
Youth is happy because it has the ability to see beauty. Anyone who keeps the ability to see beauty never grows old.
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 Franz Kafka
German is my mother tongue and as such more natural to me, but I consider Czech much more affectionate, which is why your letter removes several uncertainties; I see you more clearly, the movements of your body, your hands, so quick, so resolute, it’s almost like a meeting.
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 Franz Kafka
The history of the world, as it is written and handed down by word of mouth, often fails us completely; but man's intuitive capacity, though it often misleads, does lead, does not ever abandon one.
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 Franz Kafka
Anybody who preserves the ability to recognize beauty will never get old.
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 Franz Kafka