The Pope Benedict XVI in his allocution on the 22nd January 2011 to the officials of the Tribunal of the Roman Rota responded to two points: 1) the preparation and authorization to marriage, 2) a proper identifying cases of invalid marriages. He ordered to pay attention to legal nature of preparation to the marriage. Marriage is a legal union between a man and a woman, from which there are specific commitments. So preparing for it must be more thorough, reliable and responsible. According to the Pope, a proper canon preparation by pastors can prevent invalid marriages.