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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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"Clear skies do not promise rain."

"What is a weed? A plant whose virtues have not yet been discovered."

"A puddle repeats infinity, and is full of light; nevertheless, if analyzed objectively, a puddle is a piece of dirty water spread very thin on mud."
Explore more quotes by Gottfried Leibniz

"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."

"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."

"I also take it as granted that every created thing, and consequently the created monad also, is subject to change, and indeed that this change is continual in each one."
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