The Church of the Lord is built upon the rock of the apostles among so many dangers in the world; it therefore remains unmoved. The Church’s foundation is unshakeable and firm against the assaults of the raging sea. Waves lash at the Church but do not shatter it. Although the elements of this world constantly beat upon the Church with crashing sounds, the Church possesses the safest harbor of salvation for all in distress. Although the Church is tossed about on the sea, it rides easily on rivers, especially those rivers that Scripture speaks of: The rivers have lifted up their voice. These are the rivers flowing from the heart of the man who is given drink by Christ and who receives from the Spirit of God. When these rivers overflow with the grace of the Spirit, they lift up their voice.