41 If we pass from the moral to the intellectual causes of Modernism, the first which presents itself, and the chief one, is ignorance. Yes, these very Modernists who pose as Doctors of the Church, who puff out their cheeks when they speak of modern philosophy, and show such contempt for scholasticism, have embraced the one with all its false glamour because their ignorance of the other has left them without the means of being able to recognise confusion of thought, and to refute sophistry. Their whole system, with all its errors, has been born of the alliance between faith and false philosophy.
Source: Pascendi Dominici Gregis (Vatican.va)