Constanti Hungarorum §7

⁷ In other respects, to remove the source of many evils, it is of utmost importance that pastors never cease to admonish their flocks to refrain as far as possible from entering into mixed marriages. Let the faithful correctly understand and resolutely remember that it is their duty to regard with horror such marriages, which the Church has always detested. They are to be abhorred for the reason which we emphasized in another letter, "They offer the opportunity for a forbidden sharing and participation in sacred things; they create a danger to the religion of the Catholic partner; they are an impediment to the virtuous education of children and very often cause them to become accustomed to viewing all religions as equal because they have lost the power of discriminating between the true and the false."(2)