Canon 889

1. A vow, which is a deliberate and free promise made to God

concerning possible and better good, must be fulfilled by the

virtue of religion. 2. All who have the suitable use of reason

are capable of making a vow, unless they are prohibited by law.

3. A vow made through grave and unjust fear or fraud is null by

the law itself. 4. A vow is public if it is accepted in the

name of the Church by a legitimate ecclesiastical superior;

otherwise, it is private.