“I maintain also that substances, whether material or immaterial, cannot be conceived in their bare essence without any activity, activity being of the essence of substance in general.”
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I do not conceive of any reality at all as without genuine unity.
Gottfried Leibniz 
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I hold that the mark of a genuine idea is that its possibility can be proved, either a priori by conceiving its cause or reason, or a posteriori when experience teaches us that it is in fact in nature.
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It follows from what we have just said, that the natural changes of monads come from an internal principle, since an external cause would be unable to influence their inner being.
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Music is the pleasure the human mind experiences from counting without being aware that it is counting.
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