who wishes
to live according to the Gospel should not adjure another man. For
if, according to the Gospel mandate of Christ, it be unlawful to
swear, it is evident that neither is it lawful to adjure: and
consequently it is manifest that the high-priest unlawfully adjured
Jesus by the living God."

Obj. 2: Further, whoever adjures a man, compels him after a fashion.
But it is unlawful to compel a man against his will. Therefore
seemingly it is also unlawful to adjure a man.

Obj. 3: Further, to adjure is to induce a person to swear. Now it
belongs to man's superior to induce him to swear, for the superior
imposes an oath on his subject. Therefore subjects cannot adjure
their superiors.

_On the contrary,_ Even when we pray God we implore Him by certain
holy things: and the Apostle too besought the faithful "by the mercy
of God" (Rom. 12:1): and this seems to be a kind of adjuration.
Therefore it is lawful to adjure.

_I answer that,_ A man who utters a promissory oath, swearing by his
reverence for the Divine name, which he invokes in confirmation of
his promise, binds himself to do what he has undertaken, and so
orders himself unchangeably to do a certain thing. Now just as a man
can order himself to do a certain thing, so too can he order others,
by beseeching his superiors, or by commanding his inferiors, as
stated above (Q. 83, A. 1). Accordingly when either of these
orderings is confirmed by something Divine it is an adjuration. Yet
there is this difference between them, that man is master of his own
actions but not of those of others; wherefore he can put himself
under an obligation by invoking the Divine name, whereas he cannot
put others under such an obligation unless they be his subjects, whom
he can compel on the strength of the oath they have taken.

Therefore, if a man by invoking the name of God, or any holy thing,
intends by this adjuration to put one who is not his subject under an
obligation to do a certain thing, in the same way as he would bind
himself by oath, such an adjuration is unlawful, because he usurps
over another a power which he has not. But superiors may bind their
inferiors by this kind of adjuration, if there be need for it.

If, however, he merely intend, through reverence of the Divine name
or of some holy thing, to obtain something from the other man without
putting him under any obligation, such an adjuration may be lawfully
employed in respect of anyone.

Reply Obj. 1: Or