When K. looked at the castle, ...

When K. looked at the castle, often it seemed to him as if he were observing someone who sat quietly there in front of him gazing, not lost in thought and so oblivious of everything, but free and untroubled, as if he were alone with nobody to observe him, and yet must notice that he was observed, and all the same remained with his calm not even slightly disturbed; and really - one did not know whether it was cause or effect - the gaze of the observer could not remain concentrated there, but slid away.
When K. looked at the castle, often it seemed to him as if he were observing someone who sat quietly there in front of him gazing, not lost in thought and so oblivious of everything, but free and untroubled, as if he were alone with nobody to observe him, and yet must notice that he was observed, and all the same remained with his calm not even slightly disturbed; and really - one did not know whether it was cause or effect - the gaze of the observer could not remain concentrated there, but slid away.
 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