Summi Pontificatus §29

²⁹ The denial of the fundamentals of morality had its origin, in Europe, in the abandonment of that Christian teaching of which the Chair of Peter is the depository and exponent. That teaching had once given spiritual cohesion to a Europe which, educated, ennobled and civilized by the Cross, had reached such a degree of civil progress as to become the teacher of other peoples, of other continents. But, cut off from the infallible teaching authority of the Church, not a few separated brethren have gone so far as to overthrow the central dogma of Christianity, the Divinity of the Savior, and have hastened thereby the progress of spiritual decay.