Ethik, Teil III, Lehrsatz 19
He who conceives that the object of his love is destroyed will feel pain; if he conceives that it is preserved he will feel pleasure.
Beweis
The mind, as far as possible, endeavours to conceive those things which increase or help the body's power of activity (III. xii.); in other words (III. xii. note), those things which it loves. But conception is helped by those things which postulate the existence of a thing, and contrariwise is hindered by those which exclude the existence of a thing (II. xvii.); therefore the images of things, which postulate the existence of an object of love, help the mind's endeavour to conceive the object of love, in other words (III. xi. note), affect the mind pleasurably; contrariwise those things, which exclude the existence of an object of love, hinder the aforesaid mental endeavour; in other words, affect the mind painfully. He, therefore, who conceives that the object of his love is destroyed will feel pain, &c. 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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