The Church in all it forms and divisions has always had to live in the world; this is its necessary and dangerous situation; it has been placed in the world to witness to the world and to win the world; in so doing, it has often had to face the opposition of the world, but even more often the world has found it more effective to infiltrate into the Church and to percolate the Church by its own standards, and the result has been particularly corrosive, for the Church not only becomes infected by the world and its ways, but it also seeks to cast the mantle of piety and rectitude over its defections.