“No form remains permanently in a substance; a constant change takes place, one form is taken off and another is put on.”

Source: Guide for the Perplexed (c. 1190), Part III, Ch.8

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Maimónides 180
rabbi, physician, philosopher 1138–1204

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“It is one thing to find the Permanent; it is another thing to find a form of words in which the Permanent shall stand permanently expressed. It is one thing to experience something fixed and changeless; it is another thing to fix this something by a changeless definition. The first may be possible, while the second remains impossible for ever.”

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“No species remains constant: that great renovator of matter
Nature, endlessly fashions new forms from old: there’s nothing
in the whole universe that perishes, believe me; rather
it renews and varies its substance. What we describe as birth
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Nec species sua cuique manet, rerumque novatrix ex aliis alias reparat natura figuras: nec perit in toto quicquam, mihi credite, mundo, sed variat faciemque novat, nascique vocatur incipere esse aliud, quam quod fuit ante, morique desinere illud idem. cum sint huc forsitan illa, haec translata illuc, summa tamen omnia constant.

Nec species sua cuique manet, rerumque novatrix
ex aliis alias reparat natura figuras:
nec perit in toto quicquam, mihi credite, mundo,
sed variat faciemque novat, nascique vocatur
incipere esse aliud, quam quod fuit ante, morique
desinere illud idem. cum sint huc forsitan illa,
haec translata illuc, summa tamen omnia constant.
Book XV, 252–258 (as translated by Peter Green)
Metamorphoses (Transformations)

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“Energy cannot be created or destroyed, it can only be changed from one form to another.”

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“Nature has put itself the problem of how to catch in flight light streaming to the Earth and to store the most elusive of all powers in rigid form. The plants take in one form of power, light; and produce another power, chemical difference.”

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in Die organische Bewegung in ihrem Zusammenhange mit dem Stoffwechsel, [Julius Robert von Mayer, Die Mechanik der Wärme in gesammelten Schriften, Cotta, 1867, 53-54]
Original: Die Natur hat sich die Aufgabe gestellt, das der Erde zuströmende Licht im Fluge zu erhaschen, und die beweglichste aller Kräfte, in starre Form umgewandelt, aufzuspeichern. Zur Erreichung dieses Zweckes hat sie die Erdkruste mit Organismen überzogen, welche lebend das Sonnenlicht in sich aufnehmen und unter Verwendung dieser Kraft eine fortlaufende Summe chemischer Differenzen erzeugen.

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