Before we examine the nature, the meaning, and the beauty of Christian marriage (which St. Paul calls "a great mystery in Christ and the Holy Church"), we shall examine the essence and meaning of marriage in the realm of nature, and its specific character in reference to all other fellowships and communities. Only in this way can we understand what was so gloriously exalted by Jesus Christ and thus dispel the misinterpretations of the nature of marriage so frequently encountered. Why does Holy Scripture choose this particular relationship as an image? It is chosen because marriage is the closest and most intimate of all earthly unions in which, more than in any other, one person gives himself to another without reserve, where the other in his complete personality is the object of love, and where mutual love is in a specific way the theme (that is to say, the core) of the relationship.