Solicitous concern over the purity of doctrine reflects the truest love of God and neighbor, since doctrine, as with any of the Ten Commandments, is not an ideal that may be watered down or dismissed to suit ones fancy, but an eternal command set in stone for man's sanctification. In the same way a healthcare expert does not tolerate poison in the diet, so a true priest will never tolerate poison in the spiritual diet. It has to be pure, which means it has to be clear, without which it is poison.
But Pope Francis has now come out and slammed conservative Catholics who earnestly maintain that purity of doctrine be preserved. Concerning such people, the pope said in his Friday morning homily: "They are fanatics about things that are not clear, such as these fanatics who go about there, sowing discord in order to divide the Christian community."