Summa Theologiae by St Thomas Aquinas
FS: Treatise On Human Acts: Acts Peculiar To Man
Q18 Of The Good And Evil Of Human Acts, In General
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A4 Whether a human action is good or evil from its end?

[a] Objection 1:
It would seem that the good and evil in human actions are not from the end. For Dionysius says (Div. Nom. iv) that "nothing acts with a view to evil." If therefore an action were good or evil from its end, no action would be evil. Which is clearly false.

[b] Objection 2:
Further, the goodness of an action is something in the action. But the end is an extrinsic cause. Therefore an action is not said to be good or bad according to its end.

[c] Objection 3:
Further, a good action may happen to be ordained to an evil end, as when a man gives an alms from vainglory; and conversely, an evil action may happen to be ordained to a good end, as a theft committed in order to give something to the poor. Therefore an action is not good or evil from its end.

[d] On the contrary,
Boethius says (De Differ. Topic. ii) that "if the end is good, the thing is good, and if the end be evil, the thing also is evil."

[e] I answer that,
The disposition of things as to goodness is the same as their disposition as to being. Now in some things the being does not depend on another, and in these it suffices to consider their being absolutely. But there are things the being of which depends on something else, and hence in their regard we must consider their being in its relation to the cause on which it depends. Now just as the being of a thing depends on the agent, and the form, so the goodness of a thing depends on its end. Hence in the Divine Persons, Whose goodness does not depend on another, the measure of goodness is not taken from the end. Whereas human actions, and other things, the goodness of which depends on something else, have a measure of goodness from the end on which they depend, besides that goodness which is in them absolutely.

[f] Accordingly a fourfold goodness may be considered in a human action. First, that which, as an action, it derives from its genus; because as much as it has of action and being so much has it of goodness, as stated above [1139] (A [1]). Secondly, it has goodness according to its species; which is derived from its suitable object. Thirdly, it has goodness from its circumstances, in respect, as it were, of its accidents. Fourthly, it has goodness from its end, to which it is compared as to the cause of its goodness.

[g] Reply to Objection 1:
The good in view of which one acts is not always a true good; but sometimes it is a true good, sometimes an apparent good. And in the latter event, an evil action results from the end in view.

[h] Reply to Objection 2:
Although the end is an extrinsic cause, nevertheless due proportion to the end, and relation to the end, are inherent to the action.

[i] Reply to Objection 3:
Nothing hinders an action that is good in one of the way mentioned above, from lacking goodness in another way. And thus it may happen that an action which is good in its species or in its circumstances is ordained to an evil end, or vice versa. However, an action is not good simply, unless it is good in all those ways: since "evil results from any single defect, but good from the complete cause," as Dionysius says (Div. Nom. iv).

 
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