Combining Texts

All the ideas for 'A Puzzle about Belief', 'On Body and Force, Against the Cartesians' and 'The World'

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9 ideas

12. Knowledge Sources / B. Perception / 2. Qualities in Perception / d. Secondary qualities

22593	Our sensation of light may not be the same as what produces the sensation [Descartes]
	Full Idea: There can be a difference between our sensation of light and what is in the objects that produce that sensation in us.
	From: René Descartes (The World [1631]), quoted by Ian Dunt - How to be a Liberal 1
	A reaction: Note only that they 'may' differ, and that he does not assert that they are entirely different. Secondary qualities give information, and are not just mental events.

14. Science / D. Explanation / 2. Types of Explanation / h. Explanations by function

13195	To explain a house we must describe its use, as well as its parts [Leibniz]
	Full Idea: A house would be badly explained if we were to describe only the arrangement of its parts, but not its use.
	From: Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.255)
	A reaction: This must partly fall under pragmatics (i.e. what the enquirer is interested in). But function plays a genuine role in artefacts, and also in evolved biological organs.

15. Nature of Minds / C. Capacities of Minds / 10. Conatus/Striving

13193	Active force is not just potential for action, since it involves a real effort or striving [Leibniz]
	Full Idea: Active force should not be thought of as the simple and common potential [potentia] or receptivity to action of the schools. Rather, active force involves an effort [conatus] or striving [tendentia] toward action.
	From: Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.252)
	A reaction: This is why Leibniz is lured into making his active forces more and more animistic, till they end up like proto-minds (though never, remember, conscious and willing minds).

18. Thought / B. Mechanics of Thought / 5. Mental Files

16383	Puzzled Pierre has two mental files about the same object [Recanati on Kripke]
	Full Idea: In Kripke's puzzle about belief, the subject has two distinct mental files about one and the same object.
	From: comment on Saul A. Kripke (A Puzzle about Belief [1979]) by François Recanati - Mental Files 17.1
	A reaction: [Pierre distinguishes 'London' from 'Londres'] The Kripkean puzzle is presented as very deep, but I have always felt there was a simple explanation, and I suspect that this is it (though I will leave the reader to think it through, as I'm very busy…).

26. Natural Theory / A. Speculations on Nature / 6. Early Matter Theories / f. Ancient elements

16569	The Hot, Cold, Wet and Dry of the philosophers need themselves to be explained [Descartes]
	Full Idea: If you find it strange that in explaining these elements I do not use the qualities called Hot, Cold, Wet and Dry - as the philosophers do - I shall say to you that these qualities themselves seem to me to need explanation.
	From: René Descartes (The World [1631], 9:25-6), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 1.3
	A reaction: Nice. I take pushing the boundaries of explanation back (or down) to be the basic driving force of all human thought, in metaphysics as well as in physics.

26. Natural Theory / D. Laws of Nature / 1. Laws of Nature

13194	God's laws would be meaningless without internal powers for following them [Leibniz]
	Full Idea: To say that, in creation, God gave bodies a law for acting means nothing, unless, at the same time, he gave them something by means of which it could happen that the law is followed.
	From: Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.253)
	A reaction: This is the beginning of the modern rebellion against the medieval view of laws as imposed from outside on passive matter. Unfortunately for Leibniz, once you have postulated active internal powers, the external laws become redundant.

27. Natural Reality / A. Classical Physics / 1. Mechanics / b. Laws of motion

20964	Descartes said there was conservation of 'quantity of motion' [Descartes, by Papineau]
	Full Idea: Descartes incorporated the conservation of what he called 'quantity of motion', by which he meant mass times speed.
	From: report of René Descartes (The World [1631]) by David Papineau - Thinking about Consciousness App 2
	A reaction: Mass times velocity is now called 'momentum'. Is this the first ever conservation law? There are now lots of them.

27. Natural Reality / A. Classical Physics / 1. Mechanics / c. Forces

13196	All qualities of bodies reduce to forces [Leibniz]
	Full Idea: All qualities of bodies .....are in the end reduced [revoco] to forces.
	From: Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.256)
	A reaction: The dots conceal a long qualification, but he is essentially standing by this simple remark. If you substitute the word 'powers' for 'forces', I think that is just about right.

13192	Power is passive force, which is mass, and active force, which is entelechy or form [Leibniz]
	Full Idea: The dynamicon or power [potentia] in bodies is twofold, passive and active. Passive force [vis] constitutes matter or mass [massa], and active force constitutes entelechy or form.
	From: Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.252)
	A reaction: This is explicitly equating the innate force understood in physics with Aristotelian form. The passive force is to explain the resistance of bodies. I like the equation of force with power. He says the entelechy is 'analogous' to a soul.