The existence of an internal property of a
possible state of affairs is not expressed by a proposition,
but it expresses itself in the proposition which presents that
state of affairs, by an intern al property of this proposition.
It would be as senseless to ascribe a formal property
to a proposition as to deny it the formal property.
One cannot distinguish forms from one another by
saying that one has this proerty, the other that: for this
assumes that there is a sense in asserting either property of
either form.