„Propositions are truth-functions of elementary propositions. (An elementary proposition is a truth-function of itself.) (5)“

— Ludwig Wittgenstein

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„A tautology's truth is certain, a proposition's possible, a contradiction's impossible.“
— Ludwig Wittgenstein
„The truth of a proposition has little or nothing to do with its psychodynamics. The notion that ‘truth will prevail’ is merely a pious wish; history doesn’t show it.“
— Robert A. Heinlein
„Do the essences of proposition and of the truth determine themselves from out of the essence of the thing, or does the essence of the thing determine itself from out of the essence of the proposition? The question is posed as an either/or. However does this either/or itself suffice? Are the essence of the thing and the essence of the proposition only built as mirror images because both of them together determine themselves from out of the same but deeper lying root? However, what and where can be this common ground for the essence of the thing and of the proposition and of their origin? The unconditioned (Unbedingt)? We stated at the beginning that what conditions the essense of the thing in its thingness can no longer itself be thing and conditioned, it must be an unconditioned (Un-bedingtes). p. 47“
— Martin Heidegger
„The proper functioning of the state is dependent on the proper functioning of the individual, rather than the reverse. And the proper mode of individual Being that's redemptive is Truth. Truth is the antidote to the suffering that emerges with the fall of man in the story of Adam and Eve.“
— Jordan Peterson