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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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"When a man is wrapped up in himself, he makes a pretty small package."

"After coming into contact with a religious man I always feel I must wash my hands."

"The ideas gained by men before they are twenty-five are practically the only ideas they shall have in their lives."

"Men become civilized, not in proportion to their willingness to believe, but in proportion to their readiness to doubt."

"I have never killed a man, but I have read many obituaries with great pleasure."
Explore more quotes by Gottfried Leibniz

"Now where there are no parts, there neither extension, nor shape, nor divisibility is possible. And these monads are the true atoms of nature and, in a word, the elements of things."

"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."

"Indeed every monad must be different from every other. For there are never in nature two beings, which are precisely alike, and in which it is not possible to find some difference which is internal, or based on some intrinsic quality."

"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."

"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."

"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."

"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."

"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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