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12696
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Bodies are recreated in motion, and don't exist in intervening instants [Leibniz]
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Full Idea:
I have demonstrated that whatever moves is continuously created and that bodies are nothing at any time between the instants in motion.
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From:
Gottfried Leibniz (Letters to Thomasius [1669], 1669.04), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 1
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A reaction:
Leibniz is a little over-confident about what he has 'demonstrated', but I think (from this remark) that he would not have been displeased with quantum theory, and the notion of a 'quantum leap' and a 'Planck time'. A 'conatus' is a 'smallest motion'.
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12924
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Motion alone is relative, but force is real, and establishes its subject [Leibniz]
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Full Idea:
Motion in itself separated from force is merely relative, and one cannot establish its subject. But force is something real and absolute.
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From:
Gottfried Leibniz (Letters to Antoine Arnauld [1686], 1688.01.4/14)
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A reaction:
The striking phrase here is that force enables us to 'establish its subject'. That is, force is at the heart of reality, and hence, through causal relations, individuates objects. That's how I read it.
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12719
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Clearly, force is that from which action follows, when unimpeded [Leibniz]
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Full Idea:
The notion of force is as clear as that of action and passion, because it is that from which action follows when nothing prevents it.
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From:
Gottfried Leibniz (Letters to Paul Pellison-Fontinier [1691], A1.6.226), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 4
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A reaction:
For Leibniz, force seems to be a metaphysical notion, rather than a feature of the physical world. I take it to be the bottom level of explanation, and it equates with Aristotelian form and essence.
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13167
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We need the metaphysical notion of force to explain mechanics, and not just extended mass [Leibniz]
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Full Idea:
Considering 'extended mass' alone was not sufficient to explain the principles of mechanics and the laws of nature, but it is necessary to make use of the notion of 'force', which is very intelligible, despite belonging in the domain of metaphysics.
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From:
Gottfried Leibniz (New system of communication of substances [1695], p.139)
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A reaction:
We may find it surprising that force is a metaphysical concept, but that is worth pondering. It is a mysterious notion within physics. Notice the emphasis on what explains, and what is intelligible. He sees Descartes's system as too passive.
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12758
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It is plausible to think substances contain the same immanent force seen in our free will [Leibniz]
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Full Idea:
If we attribute an inherent force to our mind, a force acting immanently, then nothing forbids us to suppose that the same force would be found in other souls or forms, or, if you prefer, in the nature of substances.
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From:
Gottfried Leibniz (On Nature Itself (De Ipsa Natura) [1698], §10)
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A reaction:
This is the kind of bizarre idea that you are driven to, once you start thinking that God must have a will outside nature, and then that we have the same thing. Why shouldn't such a thing pop up all over the place? Only Leibniz spots the slippery slope.
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13192
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Power is passive force, which is mass, and active force, which is entelechy or form [Leibniz]
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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.
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From:
Gottfried Leibniz (On Body and Force, Against the Cartesians [1702], p.252)
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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.
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13096
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The force behind motion is like a soul, with its own laws of continual change [Leibniz]
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Full Idea:
I recognise, in the active force which exerts itself through motion, the primitive entelechy or in a word, something analogous to the soul, whose nature consists in a certain perpetual law of the same series of changes through which it runs unhindered.
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From:
Gottfried Leibniz (Letters to Burcher De Volder [1706], 1699), quoted by Cover,J/O'Leary-Hawthorne,J - Substance and Individuation in Leibniz 6.1.3
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A reaction:
This is a hugely metaphysical account of force, contrasting with Newton's largely mathematical account. He very often says that force is 'analogous' to the soul, rather than that it actually is a soul. He never quite believes that monads are real minds.
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13097
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Force in substance makes state follow state, and ensures the very existence of substance [Leibniz]
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Full Idea:
By the force I give to substances, I understand a state from which another state follows, if nothing prevents it. ...I dare say that without force, there would be no substance.
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From:
Gottfried Leibniz (Letters to Lelong [1712], 1712), quoted by Cover,J/O'Leary-Hawthorne,J - Substance and Individuation in Leibniz 7.1
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A reaction:
[the whole quote is interesting] This remark, more than any other I have found, places force at the centre of Leibniz's metaphysics. He is using it to resist Spinoza's one-substance view.
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16709
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Some people return to scholastic mysterious qualities, disguising them as 'forces' [Leibniz]
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Full Idea:
It pleases others to return to occult qualities or scholastic faculties, but since these crude philosophers and physicians see that those terms are in bad repute they change their name, calling them 'forces'.
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From:
Gottfried Leibniz (Against Barbaric physics [1716], A&G:313), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 19.7
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A reaction:
Deceptive, because Leibniz embraced forces in his revised Aristotelian essentialism. Leibniz placed forces within essences, and he is worried about forces as separate entities, unsupported by any substance.
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12709
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Motion is not absolute, but consists in relation [Leibniz]
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Full Idea:
In reality motion is not something absolute, but consists in relation.
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From:
Gottfried Leibniz (On Motion [1677], A6.4.1968), quoted by Daniel Garber - Leibniz:Body,Substance,Monad 3
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A reaction:
It is often thought that motion being relative was invented by Einstein, but Leibniz wholeheartedly embraced 'Galilean relativity', and refused to even consider any absolute concept of motion. Acceleration is a bit trickier than velocity.
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19384
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Space and time are the order of all possibilities, and don't just relate to what is actual [Leibniz]
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Full Idea:
Space and time taken together constitute the order of possibilities of the one entire universe, so that these orders relate not only to what actually is, but also to anything that could be put in its place.
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From:
Gottfried Leibniz (Reply to 'Rorarius' 2nd ed [1702], GP iv 568), quoted by Richard T.W. Arthur - Leibniz 7 'Space and Time'
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A reaction:
A very nice idea. Rather like the 'space of reasons', where all rational thought must exist, space and time are the 'space of existence and action'. Their concepts involve more than relations between what actually exists.
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19414
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Men are related to animals, which are related to plants, then to fossils, and then to the apparently inert [Leibniz]
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Full Idea:
Men are related to animals, these to plants, and the latter directly to fossils which will be linked in their turn to bodies which the senses and the imagination represent to us as perfectly dead and formless.
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From:
Gottfried Leibniz (Letters to Varignon [1702], 1702)
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A reaction:
Leibniz would be a bit surprised to find the way in which this has turned out to be largely true, since he is basing it on his picture of a hierarchy of monads. Nevertheless, the idea that we are all related wasn't invented in 1859.
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