There are evil spirits who ...

There are evil spirits who suddenly fix their abode in man's unguarded breast, causing us to commit devilish deeds, and then, hurrying back to their native hell, leave behind the stings of remorse in the poisoned bosom.
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 Friedrich Schiller

Quotes from the same author

Be noble minded! Our own heart, and not other men's opinions of us, forms our true honor.
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 Friedrich Schiller
Satisfied if they themselves can escape from the hard labour of thought, they willingly abandon to others the guardianship of their thoughts.
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 Friedrich Schiller
Art is the daughter of freedom.
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 Friedrich Schiller
It is not flesh and blood, but heart which makes us fathers and sons.
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 Friedrich Schiller
Mankind is made great or little by its own will.
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 Friedrich Schiller