It is the grace of God that will strengthen the marriage. Without the grace of Christ, there will be a danger for pride and selfishness to come in. It is the grace of Christ that will give divine power for marriage to be victorious. Yes, the Church must oblige couples to attend seminars about the preparation for marriage, as it is already being done today in many dioceses, at least in the United States. A couple should not be allowed to get married unless they undergo six months of preparation.
Lawyers go to law schools and doctors go to medical schools.
Marriage is the most difficult career. It is but right and fitting that couples who are about to get married must educate themselves about the sacrament of matrimony.