Under the sacrament of matrimony, every spouse belongs to itself only through its spouse. The husband is his own owner as far as he belongs to his wife. The wife is the freer the more she belongs to his husband.
Under the sacrament of matrimony, delivering all doesn't mean losing but receiving all.
Under the sacrament of matrimony taking care of the other is taking care of oneself, loving the other is not just like loving oneself but actually loving oneself.
Under the sacrament of matrimony, marriage is the epitome of the Church.