Thomas Aquinas · 3184 of 3516
Article. 5 - Whether those of illegitimate birth should be debarred from receiving Orders?
Objection 1: It would seem that those who are of illegitimate birth should not be debarred from receiving Orders. For the son should not bear the of the father (Ezech. 18:20); and yet he would if this were an impediment to his receiving Orders. Therefore, etc.
Objection 2: Further, one's own fault is a greater impediment than the fault of another. Now unlawful intercourse does not always debar a man from receiving Orders. Therefore neither should he be debarred by the unlawful intercourse of his father.
On the contrary, It is written (Dt. 23:2): "A mamzer, that is to say, one born of a prostitute, shall not enter into the Church of the Lord until the tenth generation." Much less therefore should he be ordained.
I answer that, Those who are ordained are placed in a position of dignity over others. Hence by a kind of propriety it is requisite that they should be without reproach, not for the validity but for the lawfulness of the , namely that they should be of good repute, bedecked with a virtuous life, and not publicly . And since a man's good name is bedimmed by a sinful origin, therefore those also who are born of an unlawful union are debarred from receiving orders, unless they receive a dispensation; and this is the more difficult to obtain, according as their origin is more discreditable.
Reply to Objection 1: Irregularity is not a punishment due for sin. Hence it is clear that those who are of illegitimate birth do not bear the of their father through being irregular.
Reply to Objection 2: What a man does by his own act can be removed by and by a contrary act; not so the things which are from nature. Hence the comparison fails between sinful act and sinful origin.