9. Truth and falsehood in general.
Truth is the marking down in words the agreement or disagreement of ideas as
it is. Falsehood is the marking down in words the agreement or disagreement of ideas otherwise than it is. And so
far as these ideas, thus marked by sounds, agree to their archetypes, so far only is the truth real. The knowledge of
this truth consists in knowing what ideas the words stand for, and the perception of the agreement or disagreement
of those ideas, according as it is marked by those words.
