Ethik, Teil IV, Lehrsatz 30
A thing cannot be bad for us through the quality which it has in common with our nature, but it is bad for us in so far as it is contrary to our nature.
Beweis
We call a thing bad when it is the cause of pain (IV. viii.), that is (by the Def., which see in III. xi. note), when it diminishes or checks our power of action. Therefore, if anything were bad for us through that quality which it has in common with our nature, it would be able itself to diminish or check that which it has in common with our nature, which (III. iv.) is absurd. Wherefore nothing can be bad for us through that quality which it has in common with us, but, on the other hand, in so far as it is bad for us, that is (as we have just shown), in so far as it can diminish or check our power of action, it is contrary to our nature. Q.E.D.
Benedict de Spinoza, The Ethics (Ethica Ordine Geometrico Demonstrata), aus dem Lateinischen übersetzt von R. H. M. Elwes.
Erstmals veröffentlicht in The Chief Works of Benedict de Spinoza, Bd. II (London: George Bell and Sons, 1884).
Diese Übersetzung ist gemeinfrei in den Vereinigten Staaten, wo sie im Jahr 1884 erschienen ist, und überall dort, wo die Schutzfrist des Urheberrechts die Lebenszeit des Urhebers plus 100 Jahre oder weniger beträgt; ihr Übersetzer starb im Jahr 1892.
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Digitaler Text: Project Gutenberg eBook #3800