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Updated: October 12, 2025
It was not for want of experience that the Cartesians were unable to conceive that one body could produce motion in another without contact. They had as much experience of other modes of producing motion as they had of that mode. The planets had revolved, and heavy bodies had fallen, every hour of their lives.
He distinctly refused to admit the will of God as a sufficient explanation of any thing except miracles; and insisted upon finding something that would account better for the phenomena of nature than a mere reference to divine volition. It was to get over this very difficulty that the Cartesians invented the system of Occasional Causes.
It is true that God is infinitely powerful; but his power is indeterminate, goodness and wisdom combined determine him to produce the best. M. Bayle makes elsewhere an objection which is peculiar to him, which he derives from the opinions of the modern Cartesians.
And as the Cartesians, more than any other school of philosophical speculation before or since, made their own minds the measure of all things, and refused, on principle, to believe that Nature had done what they were unable to see any reason why she must do, they affirmed it to be impossible that a material and a mental fact could be causes one of another.
For some of them, as the CARTESIANS in particular, having established it as a principle, that we are perfectly acquainted with the essence of matter, have very naturally inferred, that it is endowed with no efficacy, and that it is impossible for it of itself to communicate motion, or produce any of those effects, which we ascribe to it.
MALEBRANCHE. A separate niche must be made for the Cartesians, almost as great as Descartes, who filled the seventeenth century with their renown, the Frenchman Malebranche, the Dutchman Spinoza, and the German Leibnitz. All the rest we see in Him, in His light, in the light He creates in our minds. When we see, it is that we are in Him. Evidence is divine light. He is the link of ideas.
This medium, Leibnitz thought, was some per se efficient physical antecedent; while the Cartesians imagined for the purpose the theory of Occasional Causes, that is, supposed that God, not quâ mind, or quâ volition, but quâ omnipotent, intervenes to connect the volition and the motion: so far is the mind from being forced to think the action of mind on matter more natural than that of matter on matter.
The writers whom I oppose declare this inconceivable, but can conceive that mind, or volition, is per se an efficient cause: while the Cartesians could not conceive even that, but peremptorily declared that no mode of production of any fact whatever was conceivable, except the direct agency of an omnipotent being.
The question under discussion was whether the measure of vis viva is equal, as the Cartesians thought, to the product of the mass into the velocity, or, according to the Leibnitzians, to the product of the mass into the square of the velocity.
But the right of these stands good; for all the knowledge that can be acquired about mind, or the unextended substance of the Cartesians, must be acquired, like that about body, or the extended substance, within the bounds of their province, and by the means they employ, particular experiments and observations.
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