'Go ye and teach the nations' (Mtt. XXVIII, 19). This is the order Christ has given to His apostles and followers. To understand the Church doctrine in depth, one needs, therefore, to study Its teachings by the papal encyclicals and documents..
We present in this session some of the most important encyclicals and a selection of quotations against the errors and heresies of all ages, though mainly against the errors in the Modernism which has penetrated in the Church nowadays.


  • Mortalium Animos

    Encyclical of mandatory reading which scourges the errors - very praised nowadays - of ecumenism, stating once again that the Catholic Religion is the only true.

  • Syllabus

    This most up-to-date document consists on a list of thesis condemned by Pope Pius IX. It condemns many errors broadly adopted in our times, such as pantheism, religious indifferentism (ecumenism), socialism, communism, laicism, etc.

  • Pascendi Dominici Gregis

    Modernism is a heresy which has deeply penetrated into all segments of society, including – and mainly – ‘the very veins and heart of the Church’. The modernism was the last heresy condemned by the Church and the only condemnation in the whole XXth century. In spite of that, its errors are found in the mentality of many clergymen of nowadays. In this encyclical, S. Pius X makes a masterly exposition of the modernist system, which can be defined as ‘the synthesis of all heresies’. It condemns, among others, agnosticism, religious immanence and its religious sentiment, evolution of the dogmas, etc.