 The three immediate parts of a proposition are its subject idea, its predicate idea and the copula [has]. In further analyzing the subject and predicate idea of a proposition, we will find out, that in special cases (as, e.g., in the case of the idea [the judgment that God is omnipotent]), a complete proposition will turn out to be a part of an idea  (WL I, 221). In general, however, the parts of an idea are themselves ideas. After careful consideration Bolzano decided against the view to define a proposition as something constructed out of ideas (i.e., as a connection of two arbitrary ideas by means of the copula [has]) (WL II, 18); he rather suggested that we define ideas as those parts of a proposition which are not themselves propositions (WL I, 216, WL II, 18). In this sense he granted priority to propositions over their non-propositional parts (i.e., ideas), thereby anticipating Frege and Wittgenstein. There is a clear demarcation between propositions and ideas: Whereas each proposition is either true or false (WL II, 7), an idea cannot be true or false (WL I, 239 ff.). There are two “dimensions” to be distinguished in each idea: its “internal dimension”, i.e., its divisibility or indivisibility into parts, and its “external dimension”, i.e., its having or not having objects.