If indeed the Pope does not respond to the dubia or the question by an African bishop if AL can be interpreted to apply to polygamous couples too, then it seems there is a definite change in doctrine. Whether this change is a development of doctrine or not will be debated going forward…
If this is indeed a development of doctrine, it seems this could be applied to those who practice contraception and to other situations.
In any case, it is a break in the unity of the church in the sense that some bishop groups will permit the broader interpretation of AL while others will uphold the position of Pope JP2.
The doctrine is certain!
Fundamentals of Catholic Dogma, Ludwig Ott, p. 463.
The essential Properties of Marriage are unity (monogamy) an indissolubility. (Sent. certa.) CIC 1013, Par. 2.
The Council of Trent declared against Luther, who, invoking the example of the Old Testament, recognised the double marriage of the Landgraf Philip of Hessen:
“Christians are forbidden by Divine law to have several wives at the one time.” Denzinger 972.
The canon was directed against the usual form of simultaneous polygamy, namely polygyny (having several women). Polyandry (having several men) is prohibited by the natural law. as it hinders or at least gravely endangers the primary purpose of marriage. Cf. Denzinger 969, 2231 et seq.; S.c.G. IIl 124.
Denzinger:
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Council of Trent, Session XXIV (Nov. 11, 1563)
Doctrine (Concerning the Sacrament of Matrimony) * **
969 The first parent of the human race expressed the perpetual and indissoluble bond of matrimony under the influence of the divine Spirit, when he said: “This now is bone of my bone, and flesh of my flesh. Wherefore a man shall leave father and mother and shall cleave to his wife’ and they shall be two in one flesh” Gen. 2:23 f.; cf.Eph. 5:31].
But that by this bond two only are united and joined together, Christ the Lord taught more openly, when referring to those last words, as having been uttered by God, He said: “Therefore now they are not two, but one flesh” [Matt. 19:6 ], and immediately ratified the strength of this same bond, pronounced by Adam so long ago in these words: “What therefore God has joined together, let no man put asunder” Matt. 19:6; Mark10:9].
But the grace which was to perfect that natural love, and confirm the indissoluble union, and sanctify those united in marriage, Christ Himself, institutor and perfecter of the venerable sacraments, merited for us by His passion. The Apostle Paul intimates this, when he says: “Men, love your wives as Christ loved the Church, and delivered himself up for it” [Eph. 5:25], directly adding: “This is a great Sacrament; but I speak in Christ and in the Church” [Eph. 5:32].
972 Can. 2. If anyone says that it is lawful for Christians to have several) wives at the same time, and that it is not forbidden by any divine law Matt. 19:4 f.]: let him be anathema [cf. n.969 f.].
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Christian Marriage
[From the Encyclical, “Casti Connubii,” Pius Xl, Dec. 31, 1930]**
2231 [2] Another blessing of matrimony which we have spoken of as mentioned by Augustine, is the blessing of faith, which is the mutual fidelity of spouses in fulfilling the marriage contract, so that what by this contract, sanctioned by divine law, is due only to one spouse, cannot be denied him nor permitted to anyone else; nor is that to be conceded to the spouse, which can never be conceded, since it is contrary to divine rights and laws and is especially opposed to conjugal faith.
Thus this faith demands in the first place the absolute unity of marriage, which the Creator Himself established in the matrimony of our first parents when He willed that it exist only between one man and one woman And although afterwards God, the supreme legislator, somewhat relaxed this primeval law for a time, nevertheless there is no doubt that the Evangelical Law entirely restored that original and perfect unity and did away with all dispensations, as the words of Christ and the uniform way either of teaching or acting on the part of the Church plainly show [see note 969]. . . .
Nor did Christ the Lord wish to condemn only polygamy and polyandry, whether successive * or simultaneous, as they are called, or any other dishonorable act; but, in order that the sacred bonds of marriage may be absolutely inviolate, He forbade also even the willful thoughts and desires about all these things: “But I say to you that whosoever shall look on a woman to lust after her hath already committed adultery with her in his heart” Matt. 5:28]. These words of Christ the Lord cannot become void even by the consent of one spouse; for they express the law of God and of nature, which no will of man can ever break or bend. *
Even mutual familiar intercourse between spouses, that the blessing of conjugal faith may shine with due splendor, should be so distinguished by the mark of chastity that husband and wife conduct themselves in all things according to the law of God and of nature, and strive always to follow the will of the most wise and most holy Creator, with great reverence for the work of God.
patristica.net/denzinger