We have shown that socialism is an incoherent combination of thesis and antithesis, which contradict and destroy one another. Catholicism, on the contrary forms a great synthesis which includes all things in its unity, and infuses them in its sovereign harmony. It may be affirmed of Catholic dogmas, that, although they are diverse, they are one. Only an abolute negation can be opposed to this wonderful synthesis. The Catholic word is then invincible and eternal. Nothing can diminish its sovereign viture.

Essays on Catholicism, Liberalism, and Socialism, 1879.