The naturalists and Freemasons, having no faith in those things which we have learned by the revelation of God, deny that our first parents sinned, a… - Leo XIII

You have truly spoken, Cardinal : since We have been Pope, Our regards have turned towards that disinherited land. Our heart has been touched at the thought of the enormous amount of physical and moral misery that exists there. We have repeatedly urged all those who have power in their hands to put a stop to the hideous traffic called the slave-trade, and to use all and every means to secure that end. And, in as much as the African Continent is the principal scene of this traffic and, as it were, the home of slavery, We recommend all missionaries who there preach the Holy Gospel to devote their whole efforts, their whole life, to this sublime work of redemption. But it is upon you, Cardinal, that We count especially for success.

To hold, therefore, that there is no difference in matters of religion between forms that are unlike each other, and even contrary to each other, most clearly leads in the end to the rejection of all religion in both theory and practice.

Il peggior tipo di eretico è colui che, insegnando per la maggior parte la dottrina cattolica vera, aggiunge una parola di eresia come una goccia di veleno in un bicchiere d’acqua.