Sometimes a nephew with a wealthy father might be reluctant to take his uncle's daughter because he fancies his chances and is bent on making a better marriage; in another case a man would have no choice but to disobey the law because the instructions devised by the lawgiver would lead to untold trouble as for instance if they tried to compel him to marry someone suffering from lunacy or some other terrible physical or mental defect that would make the life of the partner not worth living.