Ideas from 'Letters to Thomas Burnett' by Gottfried Leibniz [1703], by Theme Structure

[found in 'Philosophical Essays' by Leibniz,Gottfried (ed/tr Arlew,R /Garber,D) [Hackett 1989,0-87220-062-0]].

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9. Objects / B. Unity of Objects / 2. Substance / a. Substance
The notion of substance is one of the keys to true philosophy
26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / c. Essence and laws
Gravity is within matter because of its structure, and it can be explained.