Finally there are simple ideas of which no definition can be given; there are also axioms or postulates, or in a word primary principles, which cannot be proved and have no need of proof.
Gottfried Leibniz
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But in simple substances the influence of one monad over another is ideal only.
- Gottfried Leibniz -
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This is why the ultimate reason of things must lie in a necessary substance, in which the differentiation of the changes only exists eminently as in their source; and this is what we call God.
- Gottfried Leibniz