Part 3968

promise. But religious who are under the power of their superiors can do certain things such as to say some psalms, or abstain from certain things. Much more therefore seemingly can they promise such things to God by means of vows.

* Objection 4: * Further, whoever does what he cannot do lawfully sins. But subjects do not sin by taking vows, since nowhere do we find this forbidden. Therefore it would seem that they can lawfully take vows.

* On the contrary, * It is commanded (Num. 30:4-6) that "if a woman vow any thing . . . being in her father's house, and yet but a girl in age," she is not bound by the vow, unless her father consent: and the same is said there (Num. 30:7-9) of the woman that has a husband. Therefore in like manner other persons that are subject to another's power cannot bind themselves by vow.

* I answer that, * As stated above (A[1]), a vow is a promise made to God. Now no man can firmly bind himself by a promise to do what is in another's power, but only to that which is entirely in his own power. Now whoever is subject to another, as to the matter wherein he is subject to him, it does not lie in his power to do as he will, but it depends on the will of the other. And therefore without the consent of his superior he cannot bind himself firmly by a vow in those matters wherein he is subject to another.

* Reply to Objection 1: * Nothing but what is virtuous can be the subject of a promise made to God, as stated above (A[2]). Now it is contrary to virtue for a man to offer to God that which belongs to another, as stated above (Q[86], A[3]). Hence the conditions necessary for a vow are not altogether ensured, when a man who is under another's power vows that which is in that other's power, except under the condition that he whose power it concerns does not gainsay it.

* Reply to Objection 2: * As soon as a man comes of age, if he be a freeman