Threat of Jansenism

De Montfort’s unfailing loyalty to Christ and His Church and his deep understanding of the immense love of God in the Incarnation and Redemption made him a militant apostle of traditional theology against these subtle and dangerous innovations. The spirit of Jansenism had by this time eaten into the very vitals of Christianity, had penetrated monasteries, seminaries, and convents, so that the Church (especially in France) seemed in danger of being undermined from within.