Combining Texts

All the ideas for 'fragments/reports', 'Definitiones cogitationesque metaphysicae' and 'On Sufficient Reason'

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5 ideas

2. Reason / B. Laws of Thought / 1. Laws of Thought

19404	Necessities rest on contradiction, and contingencies on sufficient reason [Leibniz]
	Full Idea: The principle of contradiction is the principle of necessity, and the principle that a sufficient reason must be given is the principle of contingency.
	From: Gottfried Leibniz (On Sufficient Reason [1686], p.95)
	A reaction: [this paragraph is actually undated] Contradictions occur in concrete actuality, as well as in theories and formal systems. If so, then there are necessities in nature. Are they discoverable a posteriori? Leibniz says not.

9. Objects / B. Unity of Objects / 2. Substance / d. Substance defined

12712	Substance is that which can act [Leibniz]
	Full Idea: I define substance as that which can act.
	From: Gottfried Leibniz (Definitiones cogitationesque metaphysicae [1678], A6.4.1398), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 3
	A reaction: This is in tune with the notion that to exist is to have causal powers. I find the view congenial, and the middle period of Leibniz's thought, before monads became too spiritual, chimes in with my view.

14. Science / D. Explanation / 3. Best Explanation / b. Ultimate explanation

12737	Nature can be fully explained by final causes alone, or by efficient causes alone [Leibniz]
	Full Idea: All the phenomena of nature can be explained solely by final causes, exactly as if there were no efficient causes; and all the phenomena of nature can be explained solely by efficient causes, as if there were no final causes.
	From: Gottfried Leibniz (Definitiones cogitationesque metaphysicae [1678], A6.4.1403), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 6
	A reaction: Somewhat speculative (a virtue!), but it is interesting to see him suggesting that there might be two complete and satisfactory explanations, which never touched one another. I can't see Aristotle agreeing with that.

21. Aesthetics / C. Artistic Issues / 7. Art and Morality

468	Musical performance can reveal a range of virtues [Damon of Ath.]
	Full Idea: In singing and playing the lyre, a boy will be likely to reveal not only courage and moderation, but also justice.
	From: Damon (fragments/reports [c.460 BCE], B4), quoted by (who?) - where?

26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / c. Essence and laws

19403	Each of the infinite possible worlds has its own laws, and the individuals contain those laws [Leibniz]
	Full Idea: As there are an infinity of possible worlds, there are also an infinity of laws, some proper to one, another to another, and each possible individual of any world contains in its own notion the laws of its world.
	From: Gottfried Leibniz (On Sufficient Reason [1686], p.95)
	A reaction: Hence Leibniz is not really a scientific essentialist, in that he doesn't think the laws arise out of the nature of the matter consituting the world. I wonder if the primitive matter of bodies which attaches to the monads is the same in each world?