The Church opposes gay marriage because it is against divine revelation, i.e., the word of God, Sacred Scripture; the institution of marriage which is from God - “God created man in his own image, in the image of God he created him; male and female he created them” (Gen. 1: 27; cf. also Gen. 2:24); and the natural law and natural reason. God instituted marriage as between one man and one woman and it is obvious that only a man and a woman can produce offspring naturally. For more concerning the divine institution of marriage, confer Holy Scripture, the Catechism of the Catholic Church, other church documents and ecumenical councils, and the Tradition of the Church. For the time being, I’d like to focus and make some comments on the words below.
In one sense, I believe intrinsically disordered and objectively disordered have the same sort of meaning. More specifically, in another sense, intrinsically disordered and objectively disordered can refer I think to different aspects of human actions and the moral law. In both cases, that is, intrinsically disordered and objectively disordered human actions are simply bad or evil, i.e., a sin. Objectively disordered human actions I believe refer to the object chosen, the species or kind of sin. Intrinsically disordered human actions I think refers to acting against human nature. All vice and sin is contrary to human nature where as virtue and good acts are in accord with human nature.
The CCC#1750 states that the morality of human acts depends on (1) the object chosen; (2) the end in view or the intention; and (3) the circumstances of the action. Now, there are some kinds of human acts " which, in and of themselves, independently of circumstances and intentions, are always gravely illicit by reason of their object #1 above]; such as blasphemy and perjury, murder and adultery. One may not do evil so that good may result from it" (CCC#1756). Such human acts are objectively disordered by reason of their object. The catechism will go on in the exposition of the Ten Commandments to list quite a number of other objectively disordered human acts which regardless of the circumstances and intention are simply evil or bad. Such human acts can no wise be made good because of circumstances or intention. “The object of the choice can by itself vitiate an act in its entirety”(CCC#1755). "An evil end corrupts the action, even if the object is good in itself (such as praying and fasting “in order to be seen by men”)(ibid.).
“The circumstances, including the consequences, are secondary elements of a moral act. They contribute to increasing or diminishing the moral goodness or evil of human acts (for example, the amount of a theft). They can also diminish or increase the agent’s responsibility (such as acting out of a fear of death). Circumstances of themselves cannot change the moral quality of acts themselves; they can make neither good nor right an action that is in itself evil.” (ibid. #1754).
“A morally good act requires the goodness of the object, of the end, and of the circumstances together” (ibid. #1755).
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