For what reason then do the ...

For what reason then do the realists show themselves so unfriendly toward philosophy? Because they misunderstand their own calling and with all their might want to remain restricted instead of becoming unrestricted! Why do they hate abstractions? Because they themselves are abstract since they abstract from the perfection of themselves, from the elevation of redeeming truth!
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 Max Stirner

Quotes from the same author

He who is infatuated with Man leaves persons out of account so far as that infatuation extends, and floats in an ideal, sacred interest. Man, you see, is not a person, but an ideal, a spook.
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 Max Stirner
A race of altruists is necessarily a race of slaves. A race of free men is necessarily a race of egoists.
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 Max Stirner
When every one is to cultivate himself into man, condemning a man to machine-like labor amounts to the same thing as slavery. If a factory-worker must tire himself to death twelve hours and more, he is cut off from becoming man. Every labor is to have the intent that the man be satisfied.... His labor is nothing taken by itself, has no object in itself, is nothing complete in itself; he labors only into another's hands, and is used (exploited) by this other.
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 Max Stirner
Whoever will be free must make himself free. Freedom is no fairy gift to fall into a man's lap. What is freedom? To have the will to be responsible for one's self.
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 Max Stirner