When divisions are rife in religion, it is bound to happen that what is in men's minds will soon erupt in real conflict. For while nothing is more effective for joining us together, and there is nothing which does more to unite our minds, and keep them peaceful, than agreement in religion, yet if disagreement has somehow arisen in connection with it, the inevitable result is that men are quickly stirred up to engage in fighting, and there is no other field with fiercer disputes
John Calvin