Quote by Quine, Willard Van Orman
"What cannot in principle be observed cannot significantly be said to exist."
"What cannot in principle be observed cannot significantly be said to exist."
"To be is to be the value of a variable."
"The problem of induction is to justify the rules by which we project unobserved instances from observed ones."
"Ontology is what one says exists; ideology is how one says one determines what exists."
"There is no fact of the matter about how language actually carves up the world."