Gottfried Leibniz , German philosopher
said about Ideas, Principles, Proof, Word...
"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."
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"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