„Practice is the criterion of truth.“

— Vladimir Lenin

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„A full definition of an object must include the whole of human experience, both as a criterion of truth and a practical indicator of its connection with human wants.“
— Vladimir Lenin
„How can you know if you are in the truth? The criterion is simple enough: if others make a vacuum around you, there is not a doubt in the world that you are closer to the essential than they are.“
— Emil M. Cioran
„Maintaining silence about a dirty truth is another way of lying, a common practice in high places.“
— Michael Parenti