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Ideas for 'fragments/reports', 'A World of States of Affairs' and 'Improvement of Understanding'

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14. Science / D. Explanation / 2. Types of Explanation / k. Explanations by essence

13073	To understand the properties we must know the essence, as with a circle [Spinoza]
	Full Idea: If a circle is defined as a figure in which lines from centre to circumference are equal, such definitions do not explain the essence of a circle, but only a property. The properties of a thing are not understood as long as their essences are not known.
	From: Baruch de Spinoza (Improvement of Understanding [1675], §95), quoted by Cover,J/O'Leary-Hawthorne,J - Substance and Individuation in Leibniz 1.2.1
	A reaction: This is the traditional Aristotelian view of essence, and the example of a circle is nice, though I am not sure what the essence of a circle might be. Presumably ALL the properties of a circle must flow from it.