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"Men act like brutes in so far as the sequences of their perceptions arise through the principle of memory only, like those empirical physicians who have mere practice without theory."
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"Man is the only animal that can remain on friendly terms with the victims he intends to eat until he eats them."

"The true measure of a man is how he treats someone who can do him absolutely no good."

"Many men are contemptuous of riches; few can give them away."

"One man's ways may be as good as another's, but we all like our own best."
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."

"For since it is impossible for a created monad to have a physical influence on the inner nature of another, this is the only way in which one can be dependent on another."

"Whence it follows that God is absolutely perfect, since perfection is nothing but magnitude of positive reality, in the strict sense, setting aside the limits or bounds in things which are limited."

"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."

"There are also two kinds of truths: truth of reasoning and truths of fact. Truths of reasoning are necessary and their opposite is impossible; those of fact are contingent and their opposite is possible."

"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."

"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."

"Music is the pleasure the human mind experiences from counting without being aware that it is counting."

"When a truth is necessary, the reason for it can be found by analysis, that is, by resolving it into simpler ideas and truths until the primary ones are reached."
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