(35) With regard to the basic principles related to the sacramentality of marriage, the question is more complex because the pastors of the Church have to consider the immense wealth of grace that gives dynamism to the sacramental essence of Christian marriage and its influence on the family relations derived from marriage.  God wanted the conjugal covenant from the beginning, the marriage of Creation, to be a permanent sign of Christ’s union with the Church and thus a real sacrament of the New Covenant.  The problem lies in understanding properly that this sacramentality is not something that is added or extrinsic to the natural essence of marriage, but that it is the same indissoluble marriage willed by the Creator that was elevated to a sacrament through the redeeming action of Christ, without this implying any “de-naturalization” of the reality.  By not understanding the particular feature of this sacrament compared to the others, some misunderstandings can arise that obscure the notion of sacramental marriage.  This is especially important in marriage preparation: the praiseworthy efforts to prepare the engaged to celebrate the sacrament can vanish if there is no clear understanding of what the absolutely indissoluble marriage is which they are about to contract.  Baptized persons do not present themselves to the Church just to celebrate a feast with some special rites, but to contract a lifetime marriage which is a sacrament of the New Alliance.  Through this sacrament they share in the mystery of the union of Christ and the Church, and they express their intimate and indissoluble union.[82][82]