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The aim of this book is to remind us of the dogmatic foundations of the Church as a mystery as a place and mode of communion between men at the Trinitarian banquet. To remind us that the Church is still that of Jesus Christ, animated by the Holy Spirit that the Church depends on the sacrificial love of the Son of God assuming, until his death on the cross, the fallen nature and the condition of a servant. Through his sacrificial love, the eternal Son leads the lost sheep humanity - back to his Father's house, driven by a wind constantly fired by the Spirit of Pentecost. It is this sense of mystery of the Church that the Institut Saint-Serge strives to transmit, reminding us of the Church's necessary place and the consequent importance of its theological reflection on itself, within its global vision of the Trinitarian plan for salvation."