 That is the view that Brentano puts forth in the first edition of his Psychology (1874). However, Brentano had second thoughts on this matter. While holding on to his view that existential propositions express categorical judgements, and that categorical propositions can express existential judgements, Brentano later dropped the reduction thesis. At least since 1889, Brentano no longer thought that categorical propositions only express existential judgements. He states the result of this change of view in print first in Vom Ursprung sittlicher Erkenntnis: