When the unwillingness of others to cooperate prevents Christians from committing themselves to something to which they thought they were called, they should accept that outcome as an inarguable sign of God’s will. God calls no one to do what is impossible, and so in such a case it makes no difference to one’s vocation whether the other acted rightly or wrongly. Even a wrong response, having been permitted by God, does not fall outside his plan; the insuperable obstacle of another’s no makes it clear