46 Accordingly, twin rocks of shipwreck must be carefully avoided. For, as one is wrecked upon, or comes close to, what is known as "individualism" by denying or minimizing the social and public character of the right of property, so by rejecting or minimizing the private and individual character of this same right, one inevitably runs into "collectivism" or at least closely approaches its tenets. Unless this is kept in mind, one is swept from his course upon the shoals of that moral, juridical, and social modernism which We denounced in the Encyclical issued at the beginning of Our Pontificate. And, in particular, let those realize this who, in their desire for innovation, do not scruple to reproach the Church with infamous calumnies, as if she had allowed to creep into the teachings of her theologians a pagan concept of ownership which must be completely replaced by another that they with amazing ignorance call "Christian."
Source: Quadragesimo Anno (Vatican.va)