123. After the love that unites us to God, conjugal love is the "greatest form of friendship".122 It is a union possessing all the traits of a good friendship: concern for the good of the other, reciprocity, intimacy, warmth, stability and the resemblance born of a shared life. Marriage joins to all this an indissoluble exclusivity expressed in the stable commitment to share and shape together the whole of life. Let us be honest and acknowledge the signs that this is the case. Lovers do not see their relationship as merely temporary. Those who marry do not expect their excitement to fade. Those who witness the celebration of a loving union, however fragile, trust that it will pass the test of time. Children not only want their parents to love one another, but also to be faithful and remain together. These and similar signs show that it is in the very nature of conjugal love to be definitive. The lasting union expressed by the marriage vows is more than a formality or a traditional formula; it is rooted in the natural inclinations of the human person. For believers, it is also a covenant before God that calls for fidelity: "The Lord was witness to the covenant to between you and the wife of your youth, to whom you have been faithless, though she is your companion and your wife by covenant...Let none be faithless to the wife of his youth. For I hate divorce, says the Lord" (Mal 2:14-16).
122 Thomas Aquinas, Summa Contra Gentiles III, 123; cf. Aristotle, Nicomachean Ethics, 8, 12 (ed. Bywater, Oxford, 1984, 174).
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