The reason why a good intention is not itself sufficient, but a correct choice of actions is also needed, is that the human act depends on its object, whether that object is capable or not of being ordered to God, to the One who “alone is good”, and thus brings about the perfection of the person. An act is therefore good if its object is in conformity with the good of the person with respect for the goods morally relevant for him. Christian ethics, which pays particular attention to the moral object, does not refuse to consider the inner “teleology” of acting, inasmuch as it is directed to promoting the true good of the person; but it recognizes that it is really pursued only when the essential elements of human nature are respected. The human act, good according to its object, is also capable of being ordered to its ultimate end. That same act then attains its ultimate and decisive perfection when the will actually does order it to God through charity. As the Patron of moral theologians and confessors teaches: “It is not enough to do good works; they need to be done well. For our works to be good and perfect, they must be done for the sole purpose of pleasing God”. (VS 78)

“Intrinsic evil”: it is not licit to do evil that good may come of it (cf. Rom 3:8)

One must therefore reject the thesis, characteristic of teleological and proportionalist theories, which holds that it is impossible to qualify as morally evil according to its species – its “object” – the deliberate choice of certain kinds of behaviour or specific acts, apart from a consideration of the intention for which the choice is made or the totality of the foreseeable consequences of that act for all persons concerned.

The primary and decisive element for moral judgment is the object of the human act, which establishes whether it is capable of being ordered to the good and to the ultimate end, which is God. This capability is grasped by reason in the very being of man, considered in his integral truth, and therefore in his natural inclinations, his motivations and his finalities, which always have a spiritual dimension as well. It is precisely these which are the contents of the natural law and hence that ordered complex of “personal goods” which serve the “good of the person”: the good which is the person himself and his perfection. These are the goods safeguarded by the commandments, which, according to Saint Thomas, contain the whole natural law. (VS 79)