1. Let us recall that Christ, when questioned about the unity and indissolubility of marriage, referred to what was "in the beginning." He quoted the words written in the first chapters of Genesis. In the course of these reflections, we are trying to penetrate the specific meaning of these words and these chapters.
The meaning of the original unity of man, whom God created "male and female," is obtained (especially in the light of Genesis 2:23) by knowing man in the entire endowment of his being, that is, in all the riches of that mystery of creation, on which theological anthropology is based. This knowledge, that is, the study of the human identity of the one who, at the beginning, is "alone," must always pass through duality, "communion."
Let us recall the passage of Genesis 2:23: "Then the man said, 'This at last is bone of my bones and flesh of my flesh; she shall be called woman, because she was taken out of man.'" In the light of this text, we understand that knowledge of man passes through masculinity and femininity. These are, as it were, two "incarnations" of the same metaphysical solitude before God and the world—two ways, as it were, of "being a body" and at the same time a man, which complete each other—two complementary dimensions, as it were, of self-consciousness and self-determination and, at the same time, two complementary ways of being conscious of the meaning of the body.
As Genesis 2:23 already shows, femininity finds itself, in a sense, in the presence of masculinity, while masculinity is confirmed through femininity. Precisely the function of sex, which is in a sense, "a constituent part of the person" (not just "an attribute of the person"), proves how deeply man, with all his spiritual solitude, with the never to be repeated uniqueness of his person, is constituted by the body as "he" or "she." The presence of the feminine element, alongside the male element and together with it, signifies an enrichment for man in the whole perspective of his history, including the history of salvation. All this teaching on unity has already been expressed originally in Genesis 2:23.
Rediscover the mystery of creation
2. The unity of which Genesis 2:24 speaks ("they become one flesh") is undoubtedly expressed and realized in the conjugal act. The biblical formulation, extremely concise and simple, indicates sex, femininity and masculinity, as that characteristic of man—male and female—which permits them, when they become "one flesh," to submit their whole humanity to the blessing of fertility. However, the whole context of the lapidary formulation does not permit us to stop at the surface of human sexuality. It does not allow us to deal with the body and sex outside the full dimension of man and of the "communion of persons." Right from the beginning it obliges us to see the fullness and depth which are characteristic of this unity, which man and woman must constitute in the light of the revelation of the body.
The perspective expression which says, "a man cleaves to his wife" so intimately that "they become one flesh," always induces us to refer to what the biblical text expresses previously with regard to the union in humanity, which binds the woman and the man in the very mystery of creation. The words of Genesis 2:23, just analyzed, explain this concept in a particular way. Uniting with each other (in the conjugal act) so closely as to become "one flesh," man and woman, rediscover, so to speak, every time and in a special way, the mystery of creation. They return in this way to that union in humanity ("bone of my bones and flesh of my flesh") which allows them to recognize each other and, like the first time, to call each other by name.
This means reliving, in a sense, the original virginal value of man, which emerges from the mystery of his solitude before God and in the midst of the world. The fact that they become one flesh is a powerful bond established by the Creator. Through it they discover their own humanity, both in its original unity, and in the duality of a mysterious mutual attraction.
However, sex is something more than the mysterious power of human corporality, which acts almost by virtue of instinct. At the level of man and in the mutual relationship of persons, sex expresses an ever new surpassing of the limit of man's solitude that is inherent in the constitution of his body, and determines its original meaning. This surpassing always contains within it a certain assumption of the solitude of the body of the second "self" as one's own.
Choice establishes pact
3. Therefore, it is bound up with choice. The formulation of Genesis 2:24 indicates that human beings, created as man and woman, were created for unity. It also indicates that precisely this unity, through which they become one flesh, has right from the beginning a character of union derived from a choice. We read: "A man leaves his father and mother and cleaves to his wife." If the man belongs "by nature" to his father and mother, by virtue of procreation, on the other hand, he cleaves by choice to his wife (or she to her husband).
The text of Genesis 2:24 defines this character of the conjugal bond with reference to the first man and the first woman. At the same time, it does so in the perspective of the whole earthly future of man. Therefore, in his time, Christ will appeal to that text, as equally relevant in his age. Formed in the image of God, also inasmuch as they form a true communion of persons, the first man and the first woman must constitute the beginning and the model of that communion for all men and women, who, in any period, are united so intimately as to be one flesh.
The body, which through its own masculinity or femininity right from the beginning helps both to find themselves in communion of persons, becomes, in a particular way, the constituent element of their union, when they become husband and wife. This takes place, however, through a mutual choice. This choice establishes the conjugal pact between persons,(1) who become one flesh only on this basis.
4. That corresponds to the structure of man's solitude, and in actual fact to the "twofold solitude." As the expression of self-determination, choice rests on the foundation of his self-consciousness. Only on the basis of the structure peculiar to man is he "a body" and, through the body, also male and female. When they both unite so closely as to become one flesh, their conjugal union presupposes a mature consciousness of the body. In fact, it bears within it a particular consciousness of the meaning of that body in the mutual self-giving of the persons.
In this sense too, Genesis 2:24 is a perspective text. It proves that in every conjugal union of man and woman, the same original consciousness of the unifying significance of the body in its masculinity and femininity is discovered again. At the same time, the biblical text indicates that each of these unions renews, in a way, the mystery of creation in all its original depth and vital power. "Taken out of man" as "flesh of his flesh," woman subsequently becomes, as wife and through her motherhood, mother of the living (cf. Gn 3:20), since her motherhood also has its origin in him. Procreation is rooted in creation, and every time, in a sense, reproduces its mystery.
5. A special reflection on "knowledge and procreation" will be devoted to this subject. In it, it will be necessary to refer further to other elements of the biblical text. The analysis made hitherto of the meaning of the original unity proves in what way that unity of man and woman, inherent in the mystery of creation, is "from the beginning" also given as a commitment in the perspective of all following times.
1) "The intimate partnership of married life and love has been established by the Creator and qualified by his laws, and is rooted in the conjugal covenant of irrevocable personal consent" (GS 48).
Source: L'Osservatore Romano