In any proposition, unless existence be the predicate in question, the predicate is somehow contained in the subject. The subject is defined by its predicates, and would be a different subject if these were different. Thus every true judgment of subject and predicate is analytic- i.e. the predicate forms part of the notion of the subject- unless actual existence is asserted. Existence, alone among predicates, is not contained in the notions of subjects which exist(pl9)
Gottfried Leibniz uses the terms necessary and contingent in place of analytic and synthetic, but this use prejudges, in his own favor, one of the principal issues between him and Immanuel Kant(pl16)
Analytic propositions are necessarily concerned with essences and species, not with assertions as to individuals. The subject in analytic propositions, except in such pure tautologies as "A is A," must always be complex(pl17)
The notion that all a priori truths are analytic is essentially connected with the doctrine of subject and predicate. An analytic judgment is one in which the predicate is contained in the subject(pl17)