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"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."
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"Nothing will shake a man-or at any rate a man like me-out of his merely verbal thinking and his merely notional beliefs. He has to be knocked silly before he comes to his senses. Only torture will bring out the truth. Only under torture does he discover it himself."

"There are certain truths that occurs to us, which we cannot convey in words, but requires a personal experience to grasp more vividly."

"My truth could be very different than your truth."

"There is no failure in life. It is only an experience."
Explore more quotes by Gottfried Leibniz

"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."

"It can have its effect only through the intervention of God, inasmuch as in the ideas of God a monad rightly demands that God, in regulating the rest from the beginning of things, should have regard to itself."

"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 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."

"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."

"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."

"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."
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